Payment Gateway Service

Overview

eGov Payment Gateway acts as a liaison between eGov apps and external payment gateways facilitating payments, reconciliation of payments and lookup of transactions' status'.

Pre-requisites

Before you proceed with the documentation, make sure the following pre-requisites are met -

Java 17
Kafka server is up and running
egov-persister service is running and has pg service persister config path added in it
PSQL server is running and the database is created to store transaction data.
- Note : You can follow this blog to setup postgreSQL locally and create a DB in it.

Key Functionalities

Create or initiate a transaction, to make a payment against a bill.
Make payment for multiple bill details [multi module] for a single consumer code at once.
Transaction to initiate a call to the transaction/_create API, various validations are carried out to ensure the sanctity of the request.
The response includes a generated transaction id and a redirect URL to the payment gateway itself.
Various validations are carried out to verify the authenticity of the request and the status is updated accordingly. If the transaction is successful, a receipt is generated for the same.

Payment Flow

Reconciliation

Reconciliation is carried out by two jobs scheduled via a Quartz clustered scheduler.
The early Reconciliation job is set to run every 15 minutes [configurable via app properties] and is aimed at reconciling transactions which were created 15 - 30 minutes ago and are in a PENDING state.
The daily Reconciliation job is set to run once per day and is aimed at reconciling all transactions that are in a PENDING state, except for ones which were created 30 minutes ago.

Extensions

Axis, Phonepe and Paytm payment gateways are implemented.
Additional gateways can be added by implementing the Gateway interface. No changes are required to the core packages.

Configuration Details

The following properties in the application.properties file in egov-pg-service have to be added and set to default value after integrating with the new payment gateway. In the below table properties for AXIS bank, payment gateway is shown the same relevant property needs to be added for other payment gateways.

Property

Remarks

axis.active

Bollean lag to set the payment gateway active/inactive

axis.currency

Currency representation for merchant, default(INR)

axis.merchant.id

Payment merchant Id

axis.merchant.secret.key

Secret key for payment merchant

axis.merchant.user

User name to access the payment merchant for transaction

axis.merchant.pwd

Password of the user tp access payment merchant

axis.merchant.access.code

Access code

axis.merchant.vpc.command.pay

Pay command

axis.merchant.vpc.command.status

commans status

axis.url.debit

Url for making payment

axis.url.status

URL to get the status of the transaction

Deployment Details

Deploy the latest version of egov-pg-service.
Add pg service persister yaml path in persister configuration.

Integration Details

Integration Scope

The egov-pg-service acts as communication/contact between eGov apps and external payment gateways.

Integration Benefits

Record every transaction against a bill.
Record of payment for multiple bill details for a single consumer code at once.

Integration Steps

To integrate, the host of egov-pg-service should be overwritten in helm chart
/pg-service/transaction/v1/_create should be added in the module to initiate a new payment transaction, on successful validation
/pg-service/transaction/v1/_update should be added as the update endpoint to updates an existing payment transaction. This endpoint is issued only by payment gateways to update the status of payments. It verifies the authenticity of the request with the payment gateway and forwards all query params received from a payment gateway
/pg-service/transaction/v1/_search should be added as the search endpoint for retrieving the current status of a payment in our system.