{"activeVersionTag":"latest","latestAvailableVersionTag":"latest","collection":{"info":{"_postman_id":"9742a431-c6f9-4d76-9a8e-8bc6a55dd72c","name":"Changecoins merchant API V2","description":"# ChangeCoins API\nChangeCoins API uses JSON-format as a request/response body with an HTTP status code.\n\n## Authentication and request signing\nAll requests to ChangeCoins API must be signed by `secretKey` and `publicKey` keys. (If you do not have them, please contact us [tech@changecoins.io](mailto:tech@changecoins.io).)\n\nThe request must contain 3 headers to be considered as signed:\n- `X-Processing-Key` –  account public key\n- `X-Processing-Payload` – request body encoded in `base64` format\n- `X-Processing-Signature` – request signature\n\nPayload creation example:\n```\n<?php\n$payload = base64_encode(json_encode($requestData, JSON_UNESCAPED_SLASHES));\n```\nSignature creation example:\n```\n<?php\n$signature = hash_hmac('sha256', $payload, $secretKey)\n```\n\n## Validation errors\n\nPlease, note, that the current API doesn't correspond to all existing RESTFull API requirements. The responses are unusual (not HTTP status codes) when an error occurs as a result of validation. Response HTTP status code will be 200 and the response body:\n```json\n{\n    \"err_code\": 102,\n    \"err_description\": \"error description\"\n}\n```\n\n| Parameter       | Type     | Description        |\n|-----------------|----------|--------------------|\n| err_code        | `string` | Error code.        |\n| err_description | `string` | Error description. |\n\n\n**Possible error codes**\n\n| Code     | Description            |\n|:--------:|------------------------|\n| **101**  | Merchant Not Found     |\n| **102**  | Request Data Error     |\n| **103**  | Request Is Forbidden   |\n| **104**  | Insufficient Funds     |\n| **106**  | Currency Not Allowed   |\n| **107**  | Transaction Not Found  |\n\n## Response\nSome of the responses may contain the parameter `status`. And below is listed possible statuses:\n\n| Name       | Description                                            |\n|:----------:|--------------------------------------------------------|\n| **wait**   | Request has been created and processing waiting        |\n| **done**   | Transaction has been successfully completed            |\n| **fail**   | An error occurred during the processing of the request |\n| **reject** | An error occurred when trying the processing of the request due to incorrectly specified data|\n\n> To simplify interaction with our API, you can use [API-client](https://github.com/Changecoins/http-client) 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