NestJS sdk for chapa

Features

• Initialize Transaction
• Split Payment
• Verify Payment
• Get Banks
• Create Subaccount
• Generate Transaction Reference (Utiltiy Function)
• Full TypeScript Support

Installation

NPM

$ npm i -s chapa-nestjs

Yarn

$ yarn add chapa-nestjs

Getting started

Once the installation process is complete, we can import the module either synchronously or asynchronosly into the root AppModule or any other module.

 

Synchronous configuration

import { Module } from '@nestjs/common';
import { ChapaModule } from 'chapa-nestjs';

@Module({
  imports: [
    ChapaModule.register({
      secretKey: 'your-chapa-secret-key',
    }),
  ],
})
export class AppModule {}

Asynchronous configuration

In this example, the module integrates with the awesome @nestjs/config package.

useFactory should return an object with ChapaOptions.

import { Module } from '@nestjs/common';
import { ChapaModule } from 'chapa-nestjs';
import { ConfigModule, ConfigService } from '@nestjs/config';

@Module({
  imports: [
    ChapaModule.registerAsync({
      imports: [ConfigModule],
      inject: [ConfigService],
      useFactory: async (configService: ConfigService) => ({
        secretKey: configService.get('SECRET_KEY'),
      }),
    }),
  ],
})
export class AppModule {}

Note: You can import this module from not only the root module of your app but also from other feature modules where you want to use it.

 

Generate Transaction Reference

This utility method ChapaService allows you to generating a customizable random alpha numberic transaction reference.

const tx_ref = await this.chapaService.generateTransactionReference(); // result: TX-JHBUVLM7HYMSWDA

// Or with options

const tx_ref = await this.chapaService.generateTransactionReference({
  prefix: 'tx', // defaults to `tx`
  size: 20, // defaults to `15`
});

Initialize Transaction

To initialize a transaction, we have two possilbe ways. The first one is for web payment, simply call the initialize method from ChapaService instance, and pass to it InitializeOptions options. For mobile payment use mobileInitialize, it accepts and returns the same format as the initialize method.

// Generate transaction reference using our utility method or provide your own
const tx_ref = await this.chapaService.generateTransactionReference();

const response = await this.chapaService.initialize({
  first_name: 'John',
  last_name: 'Doe',
  email: '[email protected]',
  currency: 'ETB',
  amount: '200',
  tx_ref: tx_ref,
  callback_url: 'https://example.com/',
  return_url: 'https://example.com/',
  customization: {
    title: 'Test Title',
    description: 'Test Description',
  },
});

// Generate transaction reference using our utility method or provide your own
const tx_ref = await this.chapaService.generateTransactionReference();

const response = await this.chapaService.mobileInitialize({
  first_name: 'John',
  last_name: 'Doe',
  email: '[email protected]',
  currency: 'ETB',
  amount: '200',
  tx_ref: tx_ref,
  callback_url: 'https://example.com/',
  return_url: 'https://example.com/',
  customization: {
    title: 'Test Title',
    description: 'Test Description',
  },
});

InitializeOptions

enum SplitType {
  PERCENTAGE = 'percentage',
  FLAT = 'flat',
}

interface Subaccount {
  id: string;
  split_type?: SplitType;
  transaction_charge?: number;
}

interface InitializeOptions {
  first_name: string;
  last_name: string;
  email: string;
  currency: string;
  amount: string;
  tx_ref: string;
  callback_url?: string;
  return_url?: string;
  customization?: {
    title?: string;
    description?: string;
    logo?: string;
  };
  subaccounts?: Subaccount[];
}

InitializeResponse

interface InitializeResponse {
  message: string;
  status: string;
  data: {
    checkout_url: string;
  };
}

Verify Payment

To verify payment, simply call the verify method from ChapaService instance, and pass to it VerifyOptions options.

const response = await this.chapaService.verify({
  tx_ref: 'TX-JHBUVLM7HYMSWDA',
});

VerifyOptions

interface VerifyOptions {
  tx_ref: string;
}

VerifyResponse

interface VerifyResponse {
  message: string;
  status: string;
  data: {
    first_name: string;
    last_name: string;
    email: string;
    currency: string;
    amount: string;
    charge: string;
    mode: string;
    method: string;
    type: string;
    status: string;
    reference: string;
    tx_ref: string;
    customization: {
      title: string;
      description: string;
      logo: string;
    };
    meta: any;
    created_at: Date;
    updated_at: Date;
  };
}

Get Banks

This section describes how to get bank details for all supported banks Chapa is working with. getBanks method of ChapaService instance returns all the Banks information for all currencies. The method does not accept any options.

const response = await this.chapaService.getBanks();

GetBanksResponse

type Currency = 'ETB' | 'USD';

interface Data {
  id: string;
  swift: string;
  name: string;
  acct_length: number;
  country_id: number;
  created_at: Date;
  updated_at: Date;
  is_rtgs: boolean | null;
  is_mobilemoney: boolean | null;
  currency: Currency;
}

interface GetBanksResponse {
  message: string;
  data: Data[];
}

Create Subaccount

To create subaccounts, simply call the createSubaccount method from ChapaService instance, and pass to it CreateSubaccountOptions options.

const response = await this.chapaService.createSubaccount({
  business_name: 'Test Business',
  account_name: 'John Doe',
  bank_code: '80a510ea-7497-4499-8b49-ac13a3ab7d07', // Get this from the `getBanks()` method
  account_number: '0123456789',
  split_type: SplitType.PERCENTAGE,
  split_value: 0.02,
});

CreateSubaccountOptions

interface CreateSubaccountOptions {
  business_name: string;
  account_name: string;
  bank_code: string;
  account_number: string;
  split_type: SplitType;
  split_value: number;
}

CreateSubaccountResponse

interface CreateSubaccountResponse {
  message: string;
  status: string;
  data: string;
}

Split Payment

Split payments are carried out by first creating a subaccount, then initializing the split payment. The process of implementing split payment is the same as initialize a transaction, with additional options( i.e subaccounts) to the initialize method of ChapaService.

// Generate transaction reference using our utility method or provide your own
const tx_ref = await this.chapaService.generateTransactionReference();

const response = this.chapaService.initialize({
  first_name: 'John',
  last_name: 'Doe',
  email: '[email protected]',
  currency: 'ETB',
  amount: '200',
  tx_ref: tx_ref,
  callback_url: 'https://example.com/',
  return_url: 'https://example.com/',
  customization: {
    title: 'Test Title',
    description: 'Test Description',
  },
  // Add this for split payment
  subaccounts: [
    {
      id: '80a510ea-7497-4499-8b49-ac13a3ab7d07',
    },
  ],
});

Overriding The Defaults

When collecting a payment, you can override the default split_type and split_value you set when creating the subaccount, by specifying these fields in the subaccounts item.

  subaccounts: [
    {
      id: '80a510ea-7497-4499-8b49-ac13a3ab7d07',
      split_type: SplitType.FLAT,
      transaction_charge: 25
    },
  ],

Stay in touch

• Author - Fireayehu Zekarias
• Github - https://github.com/fireayehu
• Twitter - https://twitter.com/Fireayehu
• LinkedIn - https://www.linkedin.com/in/fireayehu/

License

chapa-nestjs is MIT licensed.