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Business FinanceTop 10 Best Online Payment Processing Software of 2026
Top online payment processing software roundup with editor-style comparisons for payments teams, including where Worldpay fits and tradeoffs.
How we ranked these tools
Vendors set the topic, but our editors set the inclusion criteria and the evaluation framework before research starts.
Search agents gather the source set and the review record, including transcriptions of video reviews and podcasts.
Framework: Features 40% · Ease 30% · Value 30%
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Worldpay is the best pick for established merchants that need acquiring-grade transaction control because its settlement reconciliation support maps processing outcomes back to finance records, while 2Checkout is a solid alternative for SMB teams running recurring billing since its order and contract lifecycles keep renewals and payment events automated.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Worldpay
Settlement reconciliation support designed to map processing outcomes back to finance reporting records.
Best for: Fits when established merchants need acquiring-grade transaction control and reconciliation automation.
Adyen
Editor pickEvent-driven payment lifecycle via webhooks that support idempotent reconciliation across authorization, capture, and settlement stages.
Best for: Fits when international merchants and platform teams need deep payment lifecycle control through one integration.
2Checkout
Editor pickRecurring billing built around order and contract lifecycles, with APIs and webhooks to automate renewals and event handling.
Best for: Fits when teams need one gateway integration covering recurring billing and operational payment events.
Comparison Table
Worldpay
enterpriseGlobal payment processing and acquiring services for businesses of all sizes.
Settlement reconciliation support designed to map processing outcomes back to finance reporting records.
Worldpay fits merchants that need broad payment method coverage and consistent processing behavior across geographies and channels. The integration model supports the full transaction lifecycle, from authorization through capture and settlement posting reconciliation. Developers can use APIs to manage payment states, handle asynchronous callbacks, and keep systems synchronized without manual operator intervention.
A key tradeoff is operational depth. Teams must plan for fraud screening ruleset alignment, reconciliation workflows, and payment method mix governance across markets. Worldpay fits organizations processing higher transaction volumes that need automation around decline handling, retries, and settlement file reconciliation rather than a minimal gateway only.
- +Transaction lifecycle APIs support authorization, capture, and state transitions
- +Multi-market routing helps maintain payment method availability across geographies
- +Recurring transaction support fits merchants with repeat billing patterns
- +Settlement reconciliation workflows reduce manual finance matching effort
- –Integration often requires stronger governance around payment method mix and retries
- –Asynchronous webhooks demand more engineering for idempotency and ordering
Payment operations teams
Automate reconciliation after settlement posting
Faster month-end close
Platform engineers
Integrate payments across multiple merchants
Consistent cross-merchant behavior
Show 2 more scenarios
Billing and subscription teams
Manage recurring payment schedules
Higher billing continuity
Recurring transaction patterns enable repeatable processing for subscription renewals and installment schedules.
Fraud and risk teams
Apply rules consistently at scale
Lower manual review load
Fraud ruleset workflows and event updates support operational control over risky authorizations and declines.
Best for: Fits when established merchants need acquiring-grade transaction control and reconciliation automation.
Adyen
enterpriseOmnichannel payment platform for enterprise merchants.
Event-driven payment lifecycle via webhooks that support idempotent reconciliation across authorization, capture, and settlement stages.
Adyen fits merchants that need one payment integration across many payment methods, channels, and countries with a single orchestration layer. Its core capability is an extensive payment API that covers authorization, capture, refunds, and reporting, including support for alternative payment methods and card flows.
Adyen also provides configurable routing and operational controls that help align payment behavior with regional acquiring and processing constraints. For teams that manage higher-volume payments, its throughput-oriented design and reconciliation tooling reduce manual settlement work across payment states.
- +Single API surface for authorization, capture, refunds, and lifecycle management
- +Flexible routing controls for payment method availability and acceptance outcomes
- +Operational reporting supports reconciliation across payment states and events
- +Strong extensibility via webhooks for idempotent processing patterns
- –Complex configuration can slow time to production for multi-region setups
- –Some governance controls require additional process around account and role setup
- –Developer onboarding can be harder when aligning capture and settlement behavior
- –Fraud and dispute workflows need deliberate integration across systems
Omnichannel commerce teams
Unify online and in-store payment workflows
Consistent payment operations across channels
Product and platform developers
Control checkout routing and async updates
Predictable payment state handling
Show 2 more scenarios
Global expansion payments ops
Accept local methods across markets
Single approach across markets
Manage country-specific acquiring and local payment methods from one orchestration layer for international purchases.
Payments engineering teams
Track wallet payments through lifecycle events
Events tied to payment activity
Connect wallet and alternative payment transactions to authorization, capture, and operational events for tracking.
Best for: Fits when international merchants and platform teams need deep payment lifecycle control through one integration.
2Checkout
SMBDigital commerce and payment processing platform now operating as Verifone.
Recurring billing built around order and contract lifecycles, with APIs and webhooks to automate renewals and event handling.
2Checkout supports authorization and capture flows through its payment gateway APIs, with hosted checkout options that reduce front-end work. Transaction status, refunds, and dispute handling are tied to an order-oriented workflow that helps operations map payment events back to commerce objects. Recurring billing support is geared toward installment style schedules and contract-based renewals for subscriptions. Webhooks and API endpoints provide a predictable automation surface for ledger updates and customer notifications.
A key tradeoff is that deeper customization and routing logic depend on the gateway configuration and integration choices, which increases implementation effort for complex multi-processor setups. 2Checkout fits best when a single integration must cover cards and recurring billing while keeping reconciliation and chargeback workflows inside one operational console.
- +Order lifecycle management links statuses to payments for automation
- +Webhooks provide event-driven updates for refunds and dispute workflows
- +Recurring billing capabilities support subscriptions and scheduled renewals
- +Hosted checkout reduces PCI-sensitive front-end surface area
- –Advanced routing behavior requires careful gateway configuration discipline
- –Dispute operations can be harder to model than simple refund-only flows
Ecommerce engineering teams
Automate order-to-payment state updates
Fewer manual reconciliation steps
Subscription billing operators
Run recurring renewals and retries
Lower churn from delays
Show 1 more scenario
Fraud and risk operations
Centralize dispute evidence collection
Faster dispute response cycles
Manage refunds and dispute workflows while keeping related transaction context in one place.
Best for: Fits when teams need one gateway integration covering recurring billing and operational payment events.
Authorize.net
SMBPayment gateway service for online and in-person card transactions.
Recurring Billing with configurable schedule and automated lifecycle events for subscription payments.
Authorize.net fits teams that already run merchant accounts and want consistent gateway behavior across card and common alternative payment types. The integration surface includes transaction APIs for authorize, capture, and void plus automated recurring billing setup for subscriptions. Hosted payment pages reduce front-end PCI exposure, while token-based payment methods support repeat purchases without storing raw card data. Governance tools in the admin console support operational controls that reduce reliance on developer-only access.
- +Stable authorization and capture transaction controls for existing checkout stacks
- +Token-based payment method reuse reduces repeated card handling
- +Recurring billing configuration supports subscription workflows without heavy custom logic
- –Advanced routing and processor fallback often needs custom orchestration
- –Multi-processor scale-out requires more integration and operational discipline than gateways-only
Ecommerce engineering teams
Authorize-first checkout with capture later
More consistent fulfillment coupling
Revenue operations teams
Subscription billing with payment reuse
Lower billing operations workload
Show 1 more scenario
Payments engineering
Hosted forms for reduced PCI scope
Simpler PCI boundaries
Hosted payment pages shift sensitive entry handling away from the merchant storefront.
Best for: Fits when mid-market merchants need predictable authorize-first flows and recurring billing support.
Stripe Payments
API-firstProgrammable online payment infrastructure supporting global card payouts and bank transfers.
Webhook-based payment lifecycle events with idempotent requests for capture, refund, and dispute updates.
Stripe Payments processes card, bank, and local payment methods through a single API and focuses on developer-oriented integration patterns. The platform exposes payment, payout, and billing primitives with consistent webhooks for authorization, capture, refund, dispute, and settlement updates.
- +Unified Payments API covers cards, bank payments, and local methods
- +Webhook event model supports payment lifecycle state updates
- +SCA flows integrate with hosted or in-app authentication surfaces
- +Idempotency and automatic retry patterns reduce double-charge risk
- –Integrations often require careful webhook and state handling
- –Advanced routing and risk controls need ongoing configuration
- –Some region-specific methods require additional enablement steps
- –Complex billing setups can add operational overhead
Ecommerce engineering teams
Build card and bank checkout flows
Fewer reconciliation gaps
Fintech platform teams
Orchestrate payouts and refunds at scale
Cleaner settlement records
Show 2 more scenarios
Marketplaces
Manage multi-party payments
More predictable onboarding
Stripe supports platform-led payment flows with payout controls tied to marketplace accounting needs.
Subscription billing teams
Run recurring charges and payment updates
Lower payment churn
Stripe helps connect recurring billing events to customer status changes and payment method updates.
Best for: Fits when engineering teams want a single API and webhook-driven payment lifecycle across markets.
Square Payments
SMBAccept in-person and online payments through Square's payment processing tools.
Payment status sync via Square webhooks tied to orders and checkout sessions.
Square Payments fits merchants that want payment processing tied closely to Square’s in-person and online commerce setup, including checkout pages and point-of-sale integrations. Its core capabilities include card acceptance, invoicing-linked payments, and support for common payment flows like authorizations and captures through a unified dashboard.
- +Tight linkage between online checkout and Square POS workflows
- +Webhooks support event-driven updates for payment state changes
- +Dashboard centralizes refunds, disputes context, and payment history
- +Fraud controls and verification options fit common merchant needs
- –Customization depth is less granular than gateways built for large enterprises
- –Some advanced routing and processing controls require additional configuration
- –Developer workflows feel more Square-centric than multi-processor architectures
- –Operational reporting exports can be limiting for specialized reconciliation
Retail and hospitality operators
Unified online and POS payments
Fewer tools across locations
Ecommerce and website teams
Checkout integration with webhooks
Order state stays consistent
Show 2 more scenarios
Service businesses
Invoiced payments and follow-ups
Faster collections and refunds
Teams send invoices and record payment outcomes while keeping refund handling in the same operational view.
Small developer shops
API-first payment integration
Less glue code for state
Developers use Square APIs and webhook notifications to integrate payment capture flows into a custom storefront.
Best for: Fits when a retailer or service business wants one operational workflow across checkout, POS, and invoiced payments.
Checkout.com
enterprisePayment processing platform for enterprise and online businesses.
Authorization-to-capture control with granular payment lifecycle webhooks for precise reconciliation automation.
Checkout.com processes card and alternative payments through a payment gateway integration and routes transactions across acquiring partners. The platform focuses on API-first payment orchestration, including authorization and capture flows, tokenization, and strong 3-D Secure controls.
- +API-driven payment lifecycle supports authorization, capture, and refund state tracking
- +Tokenization reduces repeated credential handling across recurring and split payment flows
- +Dispute and lifecycle tooling maps to chargeback operations without exporting formats
- +Multi-currency handling supports routing needs for global payment method mix
- –Configuration depth demands careful onboarding to match each capture and settlement model
- –Some advanced risk and fraud behaviors depend on rule configuration rather than defaults
- –Reconciliation workflows can require building mapping logic across internal ledgers
- –Sandbox behavior may diverge from production for edge-case payment states
Digital merchants
Process card and debit transactions
Monitored card transactions
Payment routing operations teams
Coordinate routing and decline handling
Centralized routing decisions
Show 2 more scenarios
Finance and payments operations
Reconcile lifecycle events with records
More traceable reconciliation
Match payment lifecycle events and metadata to internal systems for traceable reconciliation and exception handling.
International ecommerce businesses
Accept cards and local methods globally
Broader payment acceptance
Use a common payment service to set up consistent acceptance across multiple markets.
Best for: Fits when developers need API control over payment states plus dispute workflows for global volume.
CyberSource
enterpriseVisa-owned payment management platform for online merchants.
Fraud decisioning that can run inside authorization flows through CyberSource risk and rules evaluation
CyberSource is a B2B payment processing gateway built for merchant account operations, risk controls, and payments orchestration. It supports authorization and capture workflows, tokenized payment data, and fraud decisioning through rules and hosted services.
- +Payment lifecycle APIs cover authorization, capture, reversal, and settlement coordination
- +Tokenization supports recurring billing and lower exposure of raw card data
- +Fraud rules and hosted decisioning integrate into payment authorization flows
- +Dispute and chargeback workflows fit merchants that track outcomes programmatically
- –Integration depth and configuration require developer time for correct end-to-end behavior
- –Orchestration across edge cases can be slower when multiple payment method flows are active
- –Ops teams need disciplined environment management to keep keys, routing, and settings aligned
- –Feature breadth can feel heavier than simpler gateway deployments for low-volume merchants
Enterprise payment operations
Coordinate complex payment state changes
More controlled transaction lifecycles
Ecommerce payment engineering
Accept card payments online
Consistent online authorizations
Show 2 more scenarios
Payment security teams
Add authentication workflows to card payments
Authentication built into decisions
Incorporate 3-D Secure and related security steps into card-not-present and card-present payment decisions.
Subscription billing teams
Manage stored credentials and retries
More consistent recurring charges
Handle stored credentials, recurring charges, and retry decisions for subscription or installment payments.
Best for: Fits when payment teams need gateway-grade control over authorization, tokenization, and fraud decisions via API.
PayPal Complete Payments
SMBOnline payment software for card processing, wallet payments, and checkout conversion tools.
Webhook event streams that map PayPal checkout outcomes into backend payment status updates.
PayPal Complete Payments provides payment acceptance through PayPal’s checkout and merchant-facing APIs, with orchestration across card and PayPal funding sources. It supports subscriptions and standard payment lifecycle actions like authorization and capture, which helps teams wire recurring billing and delayed capture flows into checkout.
- +Familiar PayPal customer experience with built-in PayPal payment method options
- +Webhook-driven payment lifecycle events support backend reconciliation workflows
- +Recurring billing support for subscription billing and renewal collections
- +Multi-currency support for card and PayPal flows across customer regions
- –Coverage breadth is narrower than full multi-acquirer, multi-routing processors
- –Alternative payment methods beyond PayPal can require additional integration effort
- –Advanced underwriting and routing controls are less granular than top-tier gateways
- –Operations depend on correct webhook handling and idempotency discipline
DTC ecommerce teams
Offer PayPal and cards together
Fewer manual payment-status checks
Subscription product teams
Run recurring billing with PayPal
Consistent renewal processing
Show 1 more scenario
Platform engineering teams
Integrate payment lifecycle automation
More reliable payment operations
Engineering teams use API calls and webhook events to drive capture timing and downstream reconciliation.
Best for: Fits when merchants need PayPal-first acceptance plus webhook-led payment status handling in one integration.
BlueSnap
SMBGlobal payment processing platform with merchant of record services.
Gateway-managed recurring billing tied to tokenized payment methods to drive repeat charges without re-collecting payment details.
BlueSnap targets merchants that need a payment stack spanning card processing and multiple alternative payment methods with one integration. It supports recurring billing workflows, payment status webhooks, and tokenized payment methods so repeat charges can avoid collecting raw card data again.
- +Unified API for cards and alternative payment methods
- +Recurring billing workflows reduce repeated integration work
- +Tokenized payment methods support safer repeat charging flows
- +Webhook event stream supports near real-time payment state sync
- –Complex routing scenarios can increase integration and testing time
- –Fraud controls are not as granular as ruleset-native providers
- –Advanced reconciliation requires careful mapping of settlement events
- –Some workflows depend on account configuration and enablement steps
International merchants
Route transactions by method and context
Broader method coverage
Healthcare revenue cycle teams
Collect patient and provider payments
Billing connected to payments
Show 2 more scenarios
Software engineers and platform teams
Link payment actions to order systems
Payment and order states aligned
Integrate payment creation, capture, refund, and status operations to keep order states synchronized.
Finance and payment operations
Compare transaction activity to settlement
Improved reconciliation visibility
Use transaction events and reporting data to improve visibility into status and reduce reconciliation work.
Best for: Fits when a mid-market engineering team needs one API for cards and APMs plus recurring billing automation.
Conclusion
After evaluating 10 online payment processing software, Worldpay stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
How to Choose the Right Online Payment Processing Software
Online payment processing software coordinates authorization, capture, refunds, and settlement outcomes through gateway APIs, webhooks, and reconciliation workflows. This guide covers Stripe Payments, Adyen, Worldpay, and the other six ranked options, focusing on how merchants and developers translate payment events into operational records.
The coverage contrasts integration depth, automation and API surface, and governance controls across tools such as 2Checkout and CyberSource. The goal is to map implementation effort to the lifecycle behaviors teams need for recurring billing, dispute handling, and finance-grade reporting alignment.
Online payment processing buying criteria
Each category decision maps payment lifecycle actions like authorization, capture, refunds, and settlement to the objects and callbacks exposed by a gateway integration. The listings below focus on concrete controls that change implementation effort, including idempotency behavior, event ordering for reconciliation, and how lifecycle states connect to operational workflows.
Event-driven lifecycle objects with programmable state transitions
Stripe Payments uses PaymentIntents and event-driven state transitions so teams can program authorization and capture while handling asynchronous outcomes through webhooks. Adyen provides a unified payment lifecycle API surface and event-driven webhooks that support idempotent reconciliation across authorization, capture, refunds, and settlement stages.
Recurring billing built around order and contract lifecycles
2Checkout builds recurring billing around order and contract lifecycles and uses APIs and webhooks to automate renewals and renewal events. Authorize.net supports recurring billing with a configurable schedule and automated lifecycle events that fit subscription payments with predictable authorize-first flows.
Finance-grade settlement reconciliation mapping to operational records
Worldpay emphasizes settlement reconciliation support designed to map processing outcomes back to finance reporting records. Adyen supports event-driven payment lifecycle webhooks that help reconcile authorization, capture, refund, and settlement stages back into operations for multi-region merchants.
Idempotency and retry safety for asynchronous callbacks
Stripe Payments includes idempotency keys that reduce duplicate charges during retries, which matters for webhook replays and network timeouts. Adyen provides idempotent reconciliation behavior through lifecycle webhooks, which helps keep state transitions consistent across multiple stages.
Token-based payment method reuse for recurring and split flows
Authorize.net uses token-based payment method reuse to reduce repeated card handling for recurring billing. CyberSource provides tokenization support that reduces raw card exposure for recurring billing and supports fraud decisioning inside authorization flows.
How to choose Online Payment Processing Software
Start with the lifecycle workflow the integration must model in code, then validate that the gateway exposes matching objects and event sequences for operations. After that, select the product based on whether reconciliation, recurring automation, and governance controls reduce engineering work for the specific deployment shape.
Pick the integration model that matches the payment state machine
Choose Stripe Payments if the integration needs programmable end-to-end lifecycle behavior using consistent objects like PaymentIntents and webhook events that describe authorization and capture outcomes. Choose Adyen if the integration needs a single API surface with webhooks that support idempotent reconciliation across authorization, capture, refunds, and settlement stages.
Match recurring billing automation to your order and contract model
Choose 2Checkout when recurring billing must follow order and contract lifecycles and when APIs and webhooks must automate renewals and renewal event handling. Choose Authorize.net when recurring billing requires a configurable schedule and automated lifecycle events built around predictable authorize-first flows.
Decide who owns reconciliation, then size based on webhook complexity
Choose Worldpay when finance reporting alignment depends on settlement reconciliation support that maps outcomes back to reporting records. Choose Adyen when the engineering team can implement idempotency and ordering logic for asynchronous webhooks across multi-stage lifecycle events.
Assess advanced routing requirements against governance capacity
Choose 2Checkout or Stripe Payments if routing and fallback behavior needs careful configuration but the team can invest in gateway configuration discipline. Choose Adyen if multi-region routing requirements are a core requirement and the account onboarding process can include role and process setup around governance controls.
Align fraud decisioning with authorization-time control
Choose CyberSource when fraud decisioning must run inside authorization flows through CyberSource risk and rules evaluation. Choose Checkout.com when the implementation needs authorization-to-capture control with granular lifecycle webhooks designed for precise reconciliation automation.
Who Online Payment Processing Software is for
Different tools fit different operational ownership models for payment lifecycle, recurring billing automation, and reconciliation responsibilities. The segments below map which capabilities are most likely to reduce failure modes like duplicated charges, inconsistent lifecycle states, and manual finance matching.
Platform and international merchants running multi-region acceptance
Adyen provides a single integration surface with lifecycle webhooks that support idempotent reconciliation across authorization, capture, refunds, and settlement. Adyen also supports flexible routing controls to maintain payment method availability across geographies.
Subscription merchants that need renewal automation tied to operational lifecycles
2Checkout builds recurring billing around order and contract lifecycles and uses APIs and webhooks to automate renewals and event handling. Authorize.net supports configurable recurring billing schedules and automated lifecycle events for subscription payments.
Engineering teams building programmable payment flows with strict retry behavior
Stripe Payments exposes PaymentIntents plus idempotency keys that reduce duplicate charges during retries. Checkout.com provides authorization-to-capture control and granular lifecycle webhooks for precise reconciliation automation.
Finance-heavy merchants that require settlement outcome mapping to reporting records
Worldpay is designed around settlement reconciliation support that maps processing outcomes back to finance reporting records. This reduces manual matching work when settlement file outcomes must align to operational transactions.
Common online payment processing pitfalls
Many integration failures come from treating asynchronous callbacks as if they arrive in a single ordered stream. Another frequent issue is choosing advanced routing or recurring automation workflows that do not match the team’s reconciliation and governance capacity.
Assuming webhook events can be applied without idempotency and ordering logic
Stripe Payments includes idempotency keys that reduce duplicate charges during retries, but systems still must handle repeated webhook deliveries. Adyen supports idempotent reconciliation across authorization, capture, and settlement stages, which still requires correct idempotency keys and state handling per event.
Building dispute and operational workflows around refunds only
2Checkout supports webhooks for refunds and dispute workflow updates, but dispute operations can be harder to model than refund-only flows. PayPal integrates dispute and chargeback lifecycle tooling tied to transaction data, which reduces gap risk for dispute-centric teams.
Underestimating configuration discipline needed for routing and multi-processor behavior
Stripe Payments needs careful configuration for advanced routing and fallback behavior, and that configuration impacts how outcomes map to lifecycle objects. Authorize.net can require custom orchestration for advanced routing and processor fallback, which increases integration work when scale-out involves multiple processors.
Trying to force a gateway-grade authorization-time fraud ruleset without matching the control plane
CyberSource fraud decisioning can run inside authorization flows through CyberSource risk and rules evaluation, which requires building authorization-time decision hooks. CyberSource also takes developer time for correct end-to-end behavior when multiple payment method flows are active.
How We Selected and Ranked These Tools
We evaluated integration depth by comparing how Stripe Payments, Adyen, and Worldpay map authorization, capture, refunds, and settlement outcomes into consistent objects and callback-driven workflows. Features weighed 40% based on recurring billing automation like 2Checkout contract-lifecycle renewals and dispute tooling coverage like PayPal case workflows.
Ease and value each weighed 30% based on webhook-driven reconciliation effort and retry safety like Stripe Payments idempotency keys and Adyen idempotent reconciliation behavior. 2Checkout ranked first because it combines recurring billing built around order and contract lifecycles with APIs and webhooks that automate renewals and operational payment event handling.
Frequently Asked Questions About Online Payment Processing Software
How do Stripe and Adyen differ in payment lifecycle state handling for reconciliation workflows?
When should a platform team choose a tokenization-first workflow in CyberSource versus a broader orchestration approach in Stripe?
What breaks if an integration relies only on synchronous payment responses instead of webhook events in Worldpay or Adyen?
Which tool best supports recurring billing automation tied to order or contract lifecycles: 2Checkout, Authorize.net, or BlueSnap?
How should an engineering team handle idempotency and retries when creating payments with Stripe versus Checkout.com?
When does hosted checkout help reduce PCI DSS scope in Authorize.net compared with more direct API orchestration in Stripe?
Which approach is more suitable for marketplaces that need consistent split payout and payment objects: Stripe or Square?
How do Worldpay and CyberSource differ in mapping authorization and capture outcomes back to finance records?
What admin control gaps commonly appear when moving from PayPal account-level dispute tooling to API-driven disputes in Stripe or Adyen?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
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