Square

Square Terminal API

The Terminal API lets developers integrate Square in-person payments so custom POS applications can use Square Terminal for card chip and NFC payments, with EMV certification and PCI compliance built in.

GitHub OpenAPI

Documentation

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Documentation
https://developer.squareup.com/docs/terminal-api/overview
📖
APIReference
https://developer.squareup.com/reference/square/terminal-api

Specifications

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OpenAPI
https://raw.githubusercontent.com/api-evangelist/square/refs/heads/main/openapi/square-openapi.yml