Zarinpal Adaptor for NestJs.

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Features:

• Easy to use.
• Light and fast.
• Specific error type (ZarinpalError).

How to use:

The process is very simple and includes:

• Open transaction on Zarinpal.
• Generate the URL using the result and redirect the user to the Start Pay page.
• The user will be redirected after payment is done to verify the URL you specified.

---

installation

Installation is very simple and can be done using below commands:

yarn add zarinpal-nestjs
npm install --save zarinpal-nestjs

Register the module

After successful installation, you need to register zarinpal-nestjs module in your NestJs application:

@Module({
  imports: [
    ZarinpalModule.register({
      // Required options:
      callBackUrl: 'https://google.com',
      merchantId: '32 character long merchant_id',
    }),
  ],
})
export class AppModule {}

Inject inside the class

You can check one simple example of injecting the service:

import { ZarinpalService } from 'zarinpal-nestjs';
@Controller('transaction')
export class AppController {
  constructor(
    private readonly zarinpalService: ZarinpalService,
  ) {}

Open transaction & Generate Start Pay URL

As you know you need to redirect the user to the payment gate, then the user can pay the bill. After you open a transaction and get the authorization code, you can generate the URL using the transactionOpen result like:

  async openTransaction(): Promise<string> {
      const transactionResult = await this.zarinpalService.openTransaction({
        amount: 1000,
        description: 'Buying a car (example)',
      });

      // https://www.zarinpal.com/pg/StartPay/A00000000000000000000000000387664294
      return this.zarinpalService.generateStartPayUrl(transactionResult);
  }

Verify transaction

After the user completes the payment process, will return to the URL you pass through Module registration and you can verify them like this:

@Get('verify')
async verifyTransaction(@Query() query: ZarinpalVerifyQueryParams) {
    const transaction = await this.appService.findTransactionByAuthority(
      query.Authority,
    );

    await this.zarinpalService.verifyTransaction({
      authority: query.Authority,
      amount: transaction.amount,
    });
}

Encode & Decode Authority code

Be Careful with using this method. experimental flag

As you know authority codes of transactions are pretty long and it's very bad practice to store them raw. You can encode and decode them using two predefined functions. For example:

import {
  zarinpalAuthorityEncode,
  zarinpalAuthorityDecode,
} from 'zarinpal-nestjs';

const longAuthorityCode = 'A00000000000000000000000000387664294';
const encodedAuthorityCode = zarinpalAuthorityEncode(longAuthorityCode);
const decodedEncodedAuthorityCode = zarinpalAuthorityDecode(
  encodedAuthorityCode,
);

console.log({
  encoded: encodedAuthorityCode, // 26x387664294
  decoded: decodedEncodedAuthorityCode, // A00000000000000000000000000387664294
});

for more information please read Documentation.

Simple implementation example with mongoose and mongodb

In this article there is simple example of how to use zarinpal-nestjs with mongoose and mongodb:

Integrating Zarinpal Payment Gateway in NestJS