PayTM Integration based on Django REST Framework

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PayTM | Django REST Framework

A package for PayTM integration in Django REST Framework

PayTM | Django REST Framework is a Django packaged app that provides necessary views based in Django REST Framework. It enables easy integration of PayTM Payment Gateway with Web/Mobile Application with a RESTful API based server.

Contributors: WE'RE LOOKING FOR SOMEONE WHO CAN CONTRIBUTE IN DOCS

Civil Machines Technologies Private Limited: For providing me platform and funds for research work. This project is hosted currently with CMT only.
Himanshu Shankar: Himanshu Shankar has initiated this project and worked on this project to collect useful functions and classes that are being used in various projects.

Installation

Download and Install via pip

pip install drf_paytm

or
Download and Install via easy_install

easy_install drf_paytm

Add, if wanted, drfaddons in INSTALLED_APPS (This is although not required!)

INSTALLED_APPS = [
    ...
    'drf_paytm',
    ...
]

Also add other dependencies in INSTALLED_APPS

INSTALLED_APPS = [
    ...
    'drfaddons',
    ...
]

Include urls of drf_paytm in urls.py

urlpatterns = [
    ...
    path('api/paytm/', include('drf_paytm.urls')),
    ...
]

# or

urlpatterns = [
    ...
    url(r'^api/paytm/', include('drf_paytm.urls')),
    ...
]

Run migrate command:

python manage.py migrate

Frontend API Integration Guideline

Prepare json data to post on request/ view: {"oid": "ORDER_ID", "amount": "200", "callback_url": "FRONT_END APP URL"}
callback_url: FrontEnd URL to open when payment is successful. Must not have any queryset as ?oid=ORDER_ID is appended.
Post to request/ and parse response to prepare a HTML form as per code shown below.
Don't add <input> for empty and null fields from json response of request/ API.
Set CALLBACK_URL in HTML from paytm_callback_url of JSON.
Once the payment is done, user is redirected to response/ view which will verify payment.
If payment is verified by Django Backend, user is redirected to http://callback_url?oid=ORDER_ID.
Access order/ORDER_ID/ API to get is_completed status. If it's false, check last_payment_status.

Note: In case of critical failure, server's JSON response is shown.

Sample HTML Code to be generated by FrontEnd App(from PayTM)

<html>
    <head>
        <title>Merchant Check Out Page</title>
    </head>
    <body>
        <center><h1>Please do not refresh this page...</h1></center>
        <form method="post" action="https://securegw-stage.paytm.in/theia/processTransaction" name="f1">
            <table border="1">
                <tbody>
                    <input type="hidden" name="MID" value="rxazcv89315285244163">
                    <input type="hidden" name="WEBSITE" value="WEBSTAGING">
                    <input type="hidden" name="ORDER_ID" value="order1">
                    <input type="hidden" name="CUST_ID" value="cust123">
                    <input type="hidden" name="MOBILE_NO" value="7777777777">
                    <input type="hidden" name="EMAIL" value="username@emailprovider.com">
                    <input type="hidden" name="INDUSTRY_TYPE_ID" value="Retail">
                    <input type="hidden" name="CHANNEL_ID" value="WEB">
                    <input type="hidden" name="TXN_AMOUNT" value="100.12">
                    <input type="hidden" name="CALLBACK_URL" value="https://Merchant_Response_URL>">
                    <input type="hidden" name="CHECKSUMHASH" value="ZWdMJOr1yGiFh1nns2U8sDC9VzgUDHVnQpG
                    pVnHyrrPb6bthwro1Z8AREUKdUR/K46x3XvFs6Xv7EnoSOLZT29qbZJKXXvyEuEWQIJGkw=">
                </tbody>
            </table>
        <script type="text/javascript">
            document.f1.submit();
        </script>
        </form>
    </body>
</html>

MODELS

The application has three models:

PayTMConfiguration: You need to define your PayTM configurations in this model. Only one object can have is_active set to True which will be used with PayTM API.
TransactionRequest: This will contain all the PayTM Transaction Request that one will create with PayTM.
TransactionResponse: This will contain all the responses received from PayTM API against transaction.

VIEWS

The application has following views:

ListAddTransactionRequestView: All payment request should be made on this view. Requires a logged in user. It'll provide user with required data, including checksum hash that will be used with PayTM API.
AddTransactionResponseView: Response from PayTM is posted on this view. URL for this view should go as CALLBACK_URL. This view then redirects user to FrontEnd app with OID as queryset parameter.
PayNowTransaction: This view is for testing w/o a frontend client. It will open PayTM payment page.

URLS

request/: All payment request to be made via this URL.
response/: All response from PayTM is posted on this URL.
order/OID/: Retrieve specific payment request data.
now/: For immediate testing of API, open this url.

Quickstart Guide

Complete Installation Steps (mentioned above)
Create a configuration via Django Admin in PayTM Configuration.
Provide base_url of your Backend Server.
Set is_active to True
Note: Use sandbox mode credential at first
Test API by accessing /api/paytm/now/ endpoint
Use PayTM Testing Credential:

Mobile: 7777777777
OTP: 489871
Password: Paytm12345

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This version

0.0.3

Jun 13, 2019

0.0.2

Dec 12, 2018

0.0.1

Dec 6, 2018

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drf-paytm 0.0.3

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