This document discusses payment gateway APIs and provides details about REST API architecture and common HTTP methods. It explains that a payment gateway API allows third party applications to initiate online transactions. To start a native transaction, merchants must first call the initiate transaction API, which returns a transaction token for use in other native APIs. The document includes the URL and parameters for the initiate transaction API.

1. P a y m e n t G a t e w a y A P I
1 . H e m a l k u m a r B u h a

2. What is it ?

3. Types Of API
1. SOAP
2. XML-RPC
3. JSON-RPC
4. REST

4. Arichitecuture
Of Api

5. Http Methods
The PUT, GET, POST
and DELETE methods
are typically used in
REST based
architectures. The
following table gives an
explanation of these
operations:

6. Payment Gateway API

7. Reason Behind
Choose
How Online Transaction
Will Happen Thourgh
Third party Application

8. Initiate
Transaction API
To start transaction for
native flow, merchant
need to first call this api
and this api will return
the txn Token which will
be used in all the other
native APIs.
Attribute
URL https://securegw-
stage.paytm.in/theia/api/v1/ini
tiateTransaction?mid={mid}&
orderId={order-id}
mid This is a unique identifier
provided to every merchant
by Paytm.
orderId Unique reference ID for a
transaction which is
generated by merchant
txnAmount Transaction amount and the
currency type.
callbackUrl Dynamic response urlReference :
https://developer.paytm.com/docs/
testing-integration/

9. Thank
You!