aid: aci-worldwide url: https://raw.githubusercontent.com/api-evangelist/aci-worldwide/refs/heads/main/apis.yml name: ACI Worldwide kind: company description: >- ACI Worldwide (NASDAQ: ACIW) is a US-headquartered payment-software company that builds real-time payment, card, merchant/eCommerce, and bill-payment technology for banks, processors, merchants, and billers around the world. Its enterprise portfolio spans BASE24 card and ATM switching, the ACI Enterprise Payments Platform for real-time and ISO 20022 account-to-account rails, and ACI Speedpay bill payment — most of which ship as licensed, on-premise or hosted software rather than public self-serve APIs. ACI's genuinely API-native surface is the ACI Open Payment Platform (the PAY.ON global payment gateway): a unified RESTful API documented at docs.aciworldwide.com that lets merchants and PSPs accept and manage card and alternative-payment transactions through Server-to-Server, COPYandPAY, Mobile SDK, BackOffice, and Pay By Link integrations, authenticated with an Authorization Bearer access token plus a channel entityId and complemented by PAYMENT and REGISTRATION webhook notifications. Its home market is the United States, inside the deep, fragmented, API-native US payments landscape. image: https://www.aciworldwide.com/wp-content/uploads/2021/05/cropped-android-chrome-512x512-1-192x192.png tags: - Payments - United States - Payment Gateway - Payment Processing - Acquiring - Card Payments - eCommerce - Fraud - Tokenization - 3D Secure - Bill Payment - Real-Time Payments - ISO 20022 created: '2026-07-24' modified: '2026-07-24' specificationVersion: '0.19' apis: - aid: aci-worldwide:open-payment-platform-server-to-server name: ACI Open Payment Platform — Server-to-Server API description: >- The core RESTful payment API of the ACI Open Payment Platform (PAY.ON gateway). Server-to-Server integration lets merchants and PSPs run end-to-end payment workflows — preauthorization, debit, capture, refund, and reversal — across cards and alternative payment methods. Requests are authenticated with an Authorization Bearer access token plus a channel entityId. Production host is https://eu-prod.oppwa.com and test host is https://eu-test.oppwa.com. humanURL: https://docs.aciworldwide.com/integrations/server-to-server baseURL: https://eu-prod.oppwa.com tags: - Payments - Server to Server - Card Payments - REST properties: - type: Documentation url: https://docs.aciworldwide.com/integrations/server-to-server - type: APIReference url: https://docs.aciworldwide.com/reference/parameters - type: GettingStarted url: https://docs.aciworldwide.com/integrations/widget - aid: aci-worldwide:copyandpay name: ACI COPYandPAY description: >- COPYandPAY is ACI's secure, PCI-friendly embedded payments widget for merchants and integrators. It renders a hosted card and alternative-payment form that tokenizes and submits sensitive data directly to the Open Payment Platform, reducing the merchant's PCI scope while running on the same oppwa.com gateway and access-token/entityId authentication as the Server-to-Server API. humanURL: https://docs.aciworldwide.com/integrations/widget baseURL: https://eu-prod.oppwa.com tags: - Payments - Embedded Checkout - PCI - eCommerce properties: - type: Documentation url: https://docs.aciworldwide.com/integrations/widget - type: APIReference url: https://docs.aciworldwide.com/reference/parameters - type: Components url: components/aci-worldwide-components.yml - aid: aci-worldwide:backoffice name: ACI BackOffice API description: >- BackOffice operations on the Open Payment Platform let integrators process and manage previously authorized transactions — captures, refunds, reversals, and related post-authorization actions — via the same RESTful oppwa.com gateway and bearer-token/entityId authentication. humanURL: https://docs.aciworldwide.com/integrations/backoffice baseURL: https://eu-prod.oppwa.com tags: - Payments - Refunds - Transaction Management properties: - type: Documentation url: https://docs.aciworldwide.com/integrations/backoffice - type: APIReference url: https://docs.aciworldwide.com/reference/parameters - aid: aci-worldwide:pay-by-link name: ACI Pay By Link API description: >- Pay By Link lets merchants create secure, customizable hosted payment link pages and collect payments without a full checkout integration, built on the Open Payment Platform gateway. humanURL: https://docs.aciworldwide.com/integrations/paybylink baseURL: https://eu-prod.oppwa.com tags: - Payments - Payment Links - eCommerce properties: - type: Documentation url: https://docs.aciworldwide.com/integrations/paybylink - type: APIReference url: https://docs.aciworldwide.com/reference/parameters - aid: aci-worldwide:mobile-sdk name: ACI Mobile SDK description: >- The ACI Mobile SDK lets developers accept payments inside native mobile apps, wrapping the Open Payment Platform's card and alternative-payment flows with device-side tokenization and 3-D Secure support against the same oppwa.com gateway. humanURL: https://docs.aciworldwide.com/integrations/mobile-sdk baseURL: https://eu-prod.oppwa.com tags: - Payments - Mobile SDK - In-App Payments properties: - type: Documentation url: https://docs.aciworldwide.com/integrations/mobile-sdk - type: APIReference url: https://docs.aciworldwide.com/reference/parameters common: - type: DomainSecurity url: security/aci-worldwide-domain-security.yml - type: Website url: https://www.aciworldwide.com/ - type: DeveloperPortal url: https://docs.aciworldwide.com/ - type: Documentation url: https://docs.aciworldwide.com/ - type: APIReference url: https://docs.aciworldwide.com/reference/parameters - type: GettingStarted url: https://docs.aciworldwide.com/integrations/widget - type: Support url: https://docs.aciworldwide.com/support - type: Blog url: https://www.aciworldwide.com/blog - type: TermsOfService url: https://www.aciworldwide.com/terms-of-use - type: PrivacyPolicy url: https://www.aciworldwide.com/privacy-policy - type: Authentication url: authentication/aci-worldwide-authentication.yml - type: Conventions url: conventions/aci-worldwide-conventions.yml - type: ErrorCatalog url: errors/aci-worldwide-result-codes.yml - type: DeclineCodes url: errors/aci-worldwide-decline-codes.yml - type: Webhooks url: asyncapi/aci-worldwide-webhooks.yml - type: Lifecycle url: lifecycle/aci-worldwide-lifecycle.yml - type: ChangeLog url: https://docs.aciworldwide.com/reference/release-notes - type: ChangeLog url: changelog/aci-worldwide-changelog.yml - type: Sandbox url: sandbox/aci-worldwide-sandbox.yml - type: Components url: components/aci-worldwide-components.yml - type: Conformance url: conformance/aci-worldwide-conformance.yml - type: Compliance url: conformance/aci-worldwide-conformance.yml - type: Packages url: packages/aci-worldwide-packages.yml - type: SDKs url: packages/aci-worldwide-packages.yml - type: LLMsTxt url: llms/aci-worldwide-llms.txt maintainers: - FN: Kin Lane email: kin@apievangelist.com