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How to integrate and authenticate with the Pay.so Core service.
Below is a step-by-step overview on how to register a user and complete their first crypto-to-fiat payment.
The base URL is where our API is hosted. While you are developing we recommend using our sandbox (staging) domain before switching onto production. Throughout our documentation it will be referred to as
We can offer a Postman collection bespoke to your organisation upon request. It will contain all the API requests listed in these docs along with inbuilt Authentication with your API key.