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我正在尝试将 Paytm 支付网关集成到我的网站仅用于 UPI 交易，因此在浏览文档后，我能够集成Initate 支付API，但是当我尝试集成验证 VPA API 时，它总是使 VPA 无效，我正在添加代码以供参考，我将替换my_mid为正确的 MID、my_key正确的密钥以及7777777777@paytm有效的 VPA

import requests
import json
paytmParams = dict()
paytmParams["body"] = {
    "vpa" : "7777777777@paytm"
}
paytmParams["head"] = {
    "txnToken" : "4f7197de6840450e9162ddb5c067eb221590561957267"
}
post_data = json.dumps(paytmParams)
url = "https://securegw-stage.paytm.in/theia/api/v1/vpa/validate?mid=my_mid&orderId=123abcd"
response = requests.post(url, data = post_data, headers = {"Content-type": "application/json"}).json()
print(response)

执行这个总是返回，

{
  "head": {
    "requestId": None,
    "responseTimestamp": "1590561981014",
    "version": "v1"
  },
  "body": {
    "extraParamsMap": None,
    "resultInfo": {
      "resultStatus": "F",
      "resultCode": "501",
      "resultMsg": "Sorry! We could not verify the VPA."
    },
    "vpa": "7777777777@paytm",
    "valid": False
  }
}

txnToken无论VPA如何，都可以从以下代码中获得，

import requests
import json
import hashlib
import base64
import string
import random
from Crypto.Cipher import AES

IV = "@@@@&&&&####$$$$"
BLOCK_SIZE = 16

def __pad__(s): return s + (BLOCK_SIZE - len(s) %
                            BLOCK_SIZE) * chr(BLOCK_SIZE - len(s) % BLOCK_SIZE)

def __encode__(to_encode, iv, key):
    to_encode = __pad__(to_encode)
    c = AES.new(key, AES.MODE_CBC, iv)
    to_encode = c.encrypt(to_encode)
    to_encode = base64.b64encode(to_encode)
    return to_encode.decode("UTF-8")

def __id_generator__(size=6, chars=string.ascii_uppercase + string.digits + string.ascii_lowercase):
    return ''.join(random.choice(chars) for _ in range(size))

def generate_checksum_by_str(param_str, merchant_key, salt=None):
    params_string = param_str
    salt = salt if salt else __id_generator__(4)
    final_string = '%s|%s' % (params_string, salt)
    hasher = hashlib.sha256(final_string.encode())
    hash_string = hasher.hexdigest()
    hash_string += salt
    return __encode__(hash_string, IV, merchant_key)

paytmParams = dict()
paytmParams["body"] = {
    "requestType": "Payment",
    "mid": "my_mid",
    "websiteName": "WEBSTAGING",
    "orderId": "123abcd",
    "txnAmount": {
        "value": "500",
        "currency": "INR",
    },
    "userInfo": {
        "custId": "1234567",
    },
    "enablePaymentMode":  [{"mode": "UPI", "channels": ["UPIPUSH"]}]
}
checksum = generate_checksum_by_str(
    json.dumps(paytmParams["body"]), "my_key")
paytmParams["head"] = {
    "signature" : checksum
}
post_data = json.dumps(paytmParams)
url = "https://securegw-stage.paytm.in/theia/api/v1/initiateTransaction?mid=my_mid&orderId=123abcd"
response = requests.post(url, data=post_data, headers={
                         "Content-type": "application/json"}).json()
print(response)

如果需要更多详细信息，请告诉我，因为我已经进行了各种研究，但没有得到任何运气。

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1 回答 1

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您的代码似乎没有任何问题。也许你可以再试一次。如果您仍然遇到问题，请联系 Paytm 开发人员的支持。

于 2020-06-30T11:19:26.370 回答