Introduction of the portal
Adyen's developer documentation takes users from the basics of making a payment through to advanced payments technologies, such as fraud protection and accepting payment methods from around the globe. Adyen's API Explorer is unique API reference portal, generated from OpenAPI specifications embedded in 10+ different APIs, and combined into a holistic API reference for developers.
Adyen made huge improvements to their developer portal over the past year, especially in terms of straightforward content for new customers, and clearly explanations of the nuances of their various products (of which there are many). Their API reference (API Explorer) not only lets users explore API reference information, but also make test API calls (receiving a genuine API response in the process). They are also contributing back to the community by open sourcing their OpenAPI definitions (https://github.com/Adyen/adyen-openapi).