wallet_type=nagad_api
currency_code=BDT 
Available languages (lang): en, bn

Pay attention to the description of the parameters payment_url_success_id / payment_url_fail_id/ payment_url_pending_id and success_url / fail_url / pending_url.
To use payment_url_success_id / payment_url_fail_id / payment_url_pending_id you need to send the URLs to Paykassma support and use the received IDs in the parameters.
To use success_url / fail_url / pending_url you must use hashing URLs ( For more details on hashing click here).

{
    "custom_transaction_id": "custom_transaction_1",
    "amount": 100,
    "currency": "BDT",
    "label": "test_user",
    "success_url": "https://success_url.com",
    "fail_url": "https://fail_url.com",
    "cancel_url": "https://cancel_url.com"
}

{
    "status": "ok",
	"payment_url": "Nagad_URL"// Nagad payment page
}

{
    'status': 'fail',
    'message': 'MESSAGE'
}

{
    "signature": "56beb10ead1cd49475f1e16dd668a29fff3d4fb9",
    "wallet_type": "nagad_api",
    "amount": 600,
    "currency_code": "BDT",
    "label": "234",
    "converted_amount": {"USD": 5.5, "INR": 458, "EUR": 5.05, "IDR": 84206.21, "MYR": 25.57, "VND": 131151.4, "SGD": 7.47, "THB": 193.98, "NGN": 4209.6, "TRY": 148.98, "AED": 20.19, "CAD": 7.46, "AUD": 8.62, "BDT": 600, "AFN": 462.19, "ALL": 535.91, "AMD": 2119.43, "AOA": 4550.8, "ARS": 1918.56, "AWG": 9.89, "AZN": 9.34, "BAM": 9.87, "BBD": 10.99, "BGN": 9.9, "BHD": 2.07, "BIF": 15540.93, "BMD": 5.5, "BND": 7.45, "BOB": 37.88, "BRL": 27.32, "BSD": 5.5, "BTC": 0.00021022, "BTN": 455.77, "BWP": 74.58, "BYN": 13.84, "BZD": 11.05, "CDF": 13600.07, "CHF": 4.85, "CLF": 0.17, "CLP": 4753.93, "CNH": 40.18, "CNY": 40.02, "COP": 22536.26, "CRC": 2925.32, "CUC": 5.5, "CUP": 141.53, "CVE": 556.43, "CZK": 121.42, "DJF": 976.05, "DKK": 37.67, "DOP": 311.1, "DZD": 749.34, "EGP": 169.39, "ERN": 82.44, "ETB": 302.52, "FJD": 12.49, "FKP": 4.32, "GBP": 4.32, "GEL": 14.4, "GGP": 4.32, "GHS": 62.02, "GIP": 4.32, "GMD": 332.79, "GNF": 47102.19, "GTQ": 43.03, "GYD": 1148.02, "HKD": 43.04, "HNL": 134.9, "HRK": 38.09, "HTG": 745.53, "HUF": 1939.28, "ILS": 20.81, "IMP": 4.32, "IQD": 7179.8, "IRR": 232348.9, "ISK": 725.15, "JEP": 4.32, "JMD": 846.56, "JOD": 3.89, "JPY": 799.22, "KES": 782.37, "KGS": 485.14, "KHR": 22726.5, "KMF": 2487, "KPW": 4946.52, "KRW": 7365.69, "KWD": 1.69, "KYD": 4.57, "KZT": 2489.17, "LAK": 106934.11, "LBP": 82282.64, "LKR": 1770.53, "LRD": 1023.65, "LSL": 104.54, "LYD": 26.44, "MAD": 54.04, "MDL": 97.44, "MGA": 24817.48, "MKD": 310.95, "MMK": 11511.47, "MNT": 18961.65, "MOP": 44.22, "MRO": 0, "MRU": 207.84, "MUR": 249.7, "MVR": 84.5, "MWK": 5945.5, "MXN": 93.75, "MZN": 351.07, "NAD": 105.03, "NIO": 200.54, "NOK": 58.55, "NPR": 729.23, "NZD": 9.28, "OMR": 2.11, "PAB": 5.5, "PEN": 20.39, "PGK": 19.99, "PHP": 308.95, "PKR": 1628.08, "PLN": 22.54, "PYG": 39804.77, "QAR": 19.98, "RON": 25, "RSD": 591.72, "RUB": 517.19, "RWF": 6485.95, "SAR": 20.61, "SBD": 46, "SCR": 74.05, "SDG": 3303.17, "SEK": 60.26, "SHP": 4.32, "SLL": 115251.1, "SOS": 3121.61, "SRD": 209.95, "SSP": 715.93, "STD": 122463.67, "STN": 123.63, "SVC": 47.96, "SYP": 13809.19, "SZL": 104.52, "TJS": 60.22, "TMT": 19.24, "TND": 16.96, "TOP": 13.14, "TTD": 37.18, "TWD": 175.39, "TZS": 13731.9, "UAH": 202.45, "UGX": 20472.66, "UYU": 207.44, "UZS": 66206.92, "VEF": 0, "VES": 173.52, "VUV": 652.51, "WST": 14.94, "XAF": 3310.73, "XAG": 0.24, "XAU": 0, "XCD": 14.85, "XDR": 4.11, "XOF": 3310.73, "XPD": 0, "XPF": 602.29, "XPT": 0.01, "YER": 1375.96, "ZAR": 104.77, "ZMW": 106.21, "ZWL": 1769.75, "ETH": 0.00327932, "LTC": 0.0848166, "DOGE": 86.06973908, "DASH": 0.20288551, "BCH": 0.02900566, "ZEC": 0.21915246, "ETC": 0.35471858, "XRP": 10.16340924, "TRX": 72.59371303, "XLM": 41.90497255, "WAVES": 3.60487891, "USDT": 5.49542797, "USDTTRC20": 0, "USDT20": 0},
    "direction": "ingoing",
    "created_datetime": "2023-08-20 19:04:08",
    "access_key": "FQ9jMwrNSkFbyMNqYFf6Ed4xeKmjHK",
    "additional_data": [
        {
            "activated_datetime": "2023-08-20 22:04:07",
            "exchanger_identifier": null,
            "comment": "",
            "amount": "600",
            "currency_code": "BDT",
            "wallet_type": "nagad_api",
            "stockpiling_id": 1061,
            "transaction_id": "52AD1EA4",
            "transaction_type": 1,
            "plugin_custom_order_id": "1234",
            "withdrawal_id": null,
            "withdrawal_status": null,
            "account_number": "",
            "account_name": "",
            "account_email": "",
            "bank_details": {
                "bank_code": "",
                "branch_code": ""
            }
        }
    ]
}

The Paykassma server is waiting for a response in json {"status": "ok"} response code 200, otherwise, when receiving a different response, Paykassma will forward the postback with a certain frequency.
Repeated postbacks must also be answered with {"status":"ok"} response code 200.