Authorize.net

Authorize.net Payment API

The Authorize.net Payment API enables merchants to process credit card, debit card, eCheck, Apple Pay, Google Pay, and PayPal transactions via a POST-based XML/JSON API with API Login ID and Transaction Key authentication.

GitHub

Documentation

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Documentation
https://developer.authorize.net/api/reference/
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GettingStarted
https://developer.authorize.net/hello_world/
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Authentication
https://developer.authorize.net/api/reference/features/authentication.html
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APIReference
https://developer.authorize.net/api/reference/

Other Resources

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Sandbox
https://sandbox.authorize.net/