feat: Add initiate transaction logic - paytm

quick fix

app/api/helpers/payment.py

@@ -1,6 +1,7 @@
 import json
 
 import paypalrestsdk
+import checksum
 import requests
 import stripe
 import omise
@@ -274,3 +275,22 @@ def charge_payment(order_identifier, token):
                 },
                 )
         return charge
+
+
+class PaytmPaymentsManager(object):
+    """
+    Class to manage PayTM payments
+    """
+
+    @staticmethod
+    def generate_checksum(paytm_params):
+        return Checksum.generate_checksum_by_str(json.dumps(paytm_params["body"]), "MID")
+
+
+
+
+
+
+
+
+

app/api/orders.py

@@ -1,6 +1,9 @@
 import logging
+import json
 import pytz
 from datetime import datetime
+import requests
+
 
 import omise
 from flask import request, jsonify, Blueprint, url_for, redirect
@@ -22,7 +25,7 @@
     send_notif_ticket_cancel
 from app.api.helpers.order import delete_related_attendees_for_order, set_expiry_for_order, \
     create_pdf_tickets_for_holder, create_onsite_attendees_for_order
-from app.api.helpers.payment import AliPayPaymentsManager, OmisePaymentsManager
+from app.api.helpers.payment import AliPayPaymentsManager, OmisePaymentsManager, PaytmPaymentsManager
 from app.api.helpers.payment import PayPalPaymentsManager
 from app.api.helpers.permission_manager import has_access
 from app.api.helpers.permissions import jwt_required
@@ -602,3 +605,47 @@ def omise_checkout(order_identifier):
         logging.info(f"Successful charge: {charge.id}.  Order ID: {order_identifier}")
 
         return redirect(make_frontend_url('orders/{}/view'.format(order_identifier)))
+
+
+@order_misc_routes.route('/orders/<string:order_identifier>/paytm/initiate-transaction')
+def initiate_transaction(order_identifier):
+    order = safe_query(db, Order, 'identifier', order_identifier, 'identifier')
+    paytmParams = {}
+    # body parameters
+    paytm_params["body"] = {
+        "requestType": "Payment",
+        "mid": "YOUR_MID_HERE",
+        "websiteName": "YOUR_WEBSITE_NAME",
+        "orderId": order.id,
+        "callbackUrl": url_for('',
+                                order_identifier=order.identifier, _external=True),
+        "txnAmount": {
+            "value": order.amount,
+            "currency": order.event.currency,
+        },
+        "userInfo": {
+            "custId": order.user.id,
+        },
+    }
+    checksum = PayTMPaymentsManager.generate_checksum(paytm_params)
+    # head parameters
+    paytmParams["head"] = {
+        "signature"	: checksum
+    }
+
+    post_data = json.dumps(paytm_params)
+
+    # staging
+    url = "https://securegw-stage.paytm.in/theia/api/v1/initiateTransaction?mid={}&orderId={}".\
+          format("MID", order.id)
+
+    # production
+
+    # url = "https://securegw.paytm.in/theia/api/v1/initiateTransaction?mid={}&orderId={}"
+
+    response = jsonify(requests.post(url, data = post_data, headers = {"Content-type": "application/json"}))
+
+    return response
+
+
+