{"activeVersionTag":"latest","latestAvailableVersionTag":"latest","collection":{"info":{"_postman_id":"f99d5382-2615-4ab8-ab33-35ffe2ecf94a","name":"NOWPayments Mass Payots API","description":"NOWPayments is a non-custodial cryptocurrency payment processing platform. Accept payments in a wide range of cryptos and get them instantly converted into a coin of your choice and sent to your wallet. Keeping it simple – no excess.\n\n# Authentication\nTo use the NOWPayments API you should do the following:\n\n  * Sign up at [nowpayments.io](https://nowpayments.io)\n  * Specify your outcome wallet\n  * Generate an API key\n  * Contact us to whitelist your ip\n\n# API Documentation\n\n## Instant Payments Notifications\nIPN (Instant payment notifications, or callbacks) are used to notify you when transaction status is changed.\nTo use them, you should complete the following steps:\n\n1. Generate and save the IPN Secret key in Store Settings tab at the Dashboard.\n\n2. Insert the link where you want to get callbacks in create_payout request.\nThe parameter name is ipn\\_callback\\_url\n\n3. You will receive all the parameters at this URL by POST request.\n\n4. Sort all the parameters in alphabetical order.\n\n5. Convert them to string using JSON.stringify(params, Object.keys(params).sort()) or the same function.\n\n6. Sign a string with an IPN-secret key with HMAC and sha-512 key\n\n7. Compare the signed string from the previous step with the x-nowpayments-sig , which is stored in the header of the callback request.\nIf these strings are similar it is a success.\nOtherwise, contact us on support@nowpayments.io to solve the problem.\n\nExample of creating a signed string at Node.JS\n\n    const hmac = crypto.createHmac('sha512', notificationsKey);\n    hmac.update(JSON.stringify(params, Object.keys(params).sort()));\n    const signature = hmac.digest('hex');\n\nExample of comparing signed strings in PHP\n\n    function check_ipn_request_is_valid()\n        {\n            $error_msg = \"Unknown error\";\n            $auth_ok = false;\n            $request_data = null;\n            \n \n            if (isset($_SERVER['HTTP_X_NOWPAYMENTS_SIG']) && !empty($_SERVER['HTTP_X_NOWPAYMENTS_SIG'])) {\n                $recived_hmac = $_SERVER['HTTP_X_NOWPAYMENTS_SIG'];\n \n                $request_json = file_get_contents('php://input');\n                $request_data = json_decode($request_json, true);\n                ksort($request_data);\n                $sorted_request_json = json_encode($request_data);\n \n                if ($request_json !== false && !empty($request_json)) {\n                    $hmac = hash_hmac(\"sha512\", $sorted_request_json, trim($this->ipn_secret));\n \n                    if ($hmac == $recived_hmac) {\n                        $auth_ok = true;\n                    } else {\n                        $error_msg = 'HMAC signature does not match';\n                    }\n                } else {\n                    $error_msg = 'Error reading POST data';\n                }\n            } else {\n                $error_msg = 'No HMAC signature sent.';\n            }\n    \n        }\n    \n## Payouts\n\nTo add funds to your balance , create a payment using \"create payment\" method.\nYou will see a deposit address to which you need to send the funds. When the request has been processed, the funds will be added to your balance","schema":"https://schema.getpostman.com/json/collection/v2.0.0/collection.json","isPublicCollection":false,"owner":"7907941","team":411802,"collectionId":"f99d5382-2615-4ab8-ab33-35ffe2ecf94a","publishedId":"T1DtdF9a","public":true,"publicUrl":"https://documenter-api.postman.tech/view/7907941/T1DtdF9a","privateUrl":"https://go.postman.co/documentation/7907941-f99d5382-2615-4ab8-ab33-35ffe2ecf94a","customColor":{"top-bar":"FFFFFF","right-sidebar":"303030","highlight":"EF5B25"},"documentationLayout":"classic-double-column","customisation":null,"version":"8.10.1","publishDate":"2020-07-29T16:03:20.000Z","activeVersionTag":"latest","documentationTheme":"light","metaTags":{},"logos":{}},"statusCode":200},"environments":[],"user":{"authenticated":false,"permissions":{"publish":false}},"run":{"button":{"js":"https://run.pstmn.io/button.js","css":"https://run.pstmn.io/button.css"}},"web":"https://www.getpostman.com/","team":{"logo":"https://res.cloudinary.com/postman/image/upload/t_team_logo_pubdoc/v1/team/4cdafe0c99d47ced702482e394e077d26df58a20ae76a604273728139b829231","favicon":""},"isEnvFetchError":false,"languages":"[{\"key\":\"csharp\",\"label\":\"C#\",\"variant\":\"HttpClient\"},{\"key\":\"csharp\",\"label\":\"C#\",\"variant\":\"RestSharp\"},{\"key\":\"curl\",\"label\":\"cURL\",\"variant\":\"cURL\"},{\"key\":\"dart\",\"label\":\"Dart\",\"variant\":\"http\"},{\"key\":\"go\",\"label\":\"Go\",\"variant\":\"Native\"},{\"key\":\"http\",\"label\":\"HTTP\",\"variant\":\"HTTP\"},{\"key\":\"java\",\"label\":\"Java\",\"variant\":\"OkHttp\"},{\"key\":\"java\",\"label\":\"Java\",\"variant\":\"Unirest\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"Fetch\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"jQuery\"},{\"key\":\"javascript\",\"label\":\"JavaScript\",\"variant\":\"XHR\"},{\"key\":\"c\",\"label\":\"C\",\"variant\":\"libcurl\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Axios\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Native\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Request\"},{\"key\":\"nodejs\",\"label\":\"NodeJs\",\"variant\":\"Unirest\"},{\"key\":\"objective-c\",\"label\":\"Objective-C\",\"variant\":\"NSURLSession\"},{\"key\":\"ocaml\",\"label\":\"OCaml\",\"variant\":\"Cohttp\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"cURL\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"Guzzle\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"HTTP_Request2\"},{\"key\":\"php\",\"label\":\"PHP\",\"variant\":\"pecl_http\"},{\"key\":\"powershell\",\"label\":\"PowerShell\",\"variant\":\"RestMethod\"},{\"key\":\"python\",\"label\":\"Python\",\"variant\":\"http.client\"},{\"key\":\"python\",\"label\":\"Python\",\"variant\":\"Requests\"},{\"key\":\"r\",\"label\":\"R\",\"variant\":\"httr\"},{\"key\":\"r\",\"label\":\"R\",\"variant\":\"RCurl\"},{\"key\":\"ruby\",\"label\":\"Ruby\",\"variant\":\"Net::HTTP\"},{\"key\":\"shell\",\"label\":\"Shell\",\"variant\":\"Httpie\"},{\"key\":\"shell\",\"label\":\"Shell\",\"variant\":\"wget\"},{\"key\":\"swift\",\"label\":\"Swift\",\"variant\":\"URLSession\"}]","languageSettings":[{"key":"csharp","label":"C#","variant":"HttpClient"},{"key":"csharp","label":"C#","variant":"RestSharp"},{"key":"curl","label":"cURL","variant":"cURL"},{"key":"dart","label":"Dart","variant":"http"},{"key":"go","label":"Go","variant":"Native"},{"key":"http","label":"HTTP","variant":"HTTP"},{"key":"java","label":"Java","variant":"OkHttp"},{"key":"java","label":"Java","variant":"Unirest"},{"key":"javascript","label":"JavaScript","variant":"Fetch"},{"key":"javascript","label":"JavaScript","variant":"jQuery"},{"key":"javascript","label":"JavaScript","variant":"XHR"},{"key":"c","label":"C","variant":"libcurl"},{"key":"nodejs","label":"NodeJs","variant":"Axios"},{"key":"nodejs","label":"NodeJs","variant":"Native"},{"key":"nodejs","label":"NodeJs","variant":"Request"},{"key":"nodejs","label":"NodeJs","variant":"Unirest"},{"key":"objective-c","label":"Objective-C","variant":"NSURLSession"},{"key":"ocaml","label":"OCaml","variant":"Cohttp"},{"key":"php","label":"PHP","variant":"cURL"},{"key":"php","label":"PHP","variant":"Guzzle"},{"key":"php","label":"PHP","variant":"HTTP_Request2"},{"key":"php","label":"PHP","variant":"pecl_http"},{"key":"powershell","label":"PowerShell","variant":"RestMethod"},{"key":"python","label":"Python","variant":"http.client"},{"key":"python","label":"Python","variant":"Requests"},{"key":"r","label":"R","variant":"httr"},{"key":"r","label":"R","variant":"RCurl"},{"key":"ruby","label":"Ruby","variant":"Net::HTTP"},{"key":"shell","label":"Shell","variant":"Httpie"},{"key":"shell","label":"Shell","variant":"wget"},{"key":"swift","label":"Swift","variant":"URLSession"}],"languageOptions":[{"label":"C# - 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