API

OnPay's API is used when integrating external systems with OnPay, such as webshops or ERP systems etc. Custom API integrations are used for systems that doesn't have built-in or plugin support for OnPay, or if specialized functionality is required by the merchant. In such cases a programmer may develop a software integration to establish communication between the two systems to perform actions and exchange information when processing transactions.

Documentation for OnPay's API can be found via the link below. The documentation includes code examples in multiple programming languages with sample output, response codes, etc.

Link to API documentation: API documentation

Introduction to OAuth 2.0 and Tokens: About OAuth2