# Payin API
This section covers technical details of the Payin API. It contains functional examples of the requests and important observations to be taken into account during integration.
TIP
- All calls to the Payin API use HTTP POST Request.
- All calls to the Payin API should with JSON body parameters.
- All calls to the Payin API will return JSON responses, including errors.
# Content
Environment
- Sandbox environment vs Production.
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- How to submit a payin request.
Notification
- Receiving a notification. When and how.
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- Use JS to get token and fingerprint
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- Get support bank list for Cash and Banktransfer payment
Payin Detail
- Query the details of an order
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- Query the installment detail of a credit card order
Refund
- Submit refund request
Data
- Some usefully data like methods, test data, etc
API Code
- transfersmile Payin API Code