PostFinance Checkout TypeScript Library

The PostFinance Checkout TypeScript library wraps around the PostFinance Checkout API. This library facilitates your interaction with various services such as transactions, accounts, and subscriptions.

Documentation

PostFinance Checkout Web Service API

Requirements

• npm 6+

Installation

>NOTE: Highly recommended to use TypeScript SDK in server-side applications.
Use front-end frameworks such as Angular at your own risk, as the application might be incompatible or cause a potential threat that the application user information (such as secret keys) might be revealed publicly in the browser.

NPM install (recommended)

npm install postfinancecheckout

Usage

The library needs to be configured with your account's space id, user id, and secret key which are available in your PostFinance Checkout account dashboard. Set space_id, user_id, and api_secret to their values. You can also add custom default headers to the configuration.

Configuring a Service

'use strict';
import { PostFinanceCheckout } from 'postfinancecheckout';

let spaceId: number = 405;
let userId: number = 512;
let apiSecret: string = 'FKrO76r5VwJtBrqZawBspljbBNOxp5veKQQkOnZxucQ=';

let config = {
    space_id: spaceId,
    user_id: userId,
    api_secret: apiSecret
    default_headers: {
        'x-meta-header-name-1': 'header-value-1',
        'x-meta-header-name-2': 'header-value-2'
    }
}

// Transaction Service
let transactionService: PostFinanceCheckout.api.TransactionService = new PostFinanceCheckout.api.TransactionService(config);

To get started with sending transactions, please review the example below:

'use strict';
import { PostFinanceCheckout } from 'postfinancecheckout';

let spaceId: number = 405;
let userId: number = 512;
let apiSecret: string = 'FKrO76r5VwJtBrqZawBspljbBNOxp5veKQQkOnZxucQ=';

let config = {
    space_id: spaceId,
    user_id: userId,
    api_secret: apiSecret
}

// Transaction Service
let transactionService: PostFinanceCheckout.api.TransactionService = new PostFinanceCheckout.api.TransactionService(config);

// TransactionPaymentPage Service
let transactionPaymentPageService: PostFinanceCheckout.api.TransactionPaymentPageService = new PostFinanceCheckout.api.TransactionPaymentPageService(config);

// LineItem of type PRODUCT
let lineItem: PostFinanceCheckout.model.LineItemCreate = new PostFinanceCheckout.model.LineItemCreate();
lineItem.name='Red T-Shirt';
lineItem.uniqueId='5412';
lineItem.sku='red-t-shirt-123';
lineItem.quantity=1;
lineItem.amountIncludingTax=3.50;
lineItem.type=PostFinanceCheckout.model.LineItemType.PRODUCT;

// Transaction
let transaction: PostFinanceCheckout.model.TransactionCreate = new PostFinanceCheckout.model.TransactionCreate();
transaction.lineItems=[lineItem];
transaction.autoConfirmationEnabled=true;
transaction.currency='EUR';

transactionService.create(spaceId, transaction).then((response) => {
    let transactionCreate: PostFinanceCheckout.model.Transaction = response.body;
    transactionPaymentPageService.paymentPageUrl(spaceId,  transactionCreate.id).then(function (response) {
        let pageUrl: string = response.body;
        // window.location.href = pageUrl;
    });
});

Configure connection timeout

Connection timeout determines how long the request can take, before cutting off the connection. Same value applies both to inner 'Read timeout' and 'Connection timeout' of a NPM request module.

Default connection timeout is 25s.

Connection timeout can be set 2 ways:

1. Via configuration property 'timeout' providing value in seconds.

let config = {
    ... other properties ...
    timeout: 15
}
let transactionService: PostFinanceCheckout.api.TransactionService = new PostFinanceCheckout.api.TransactionService(config);

2. Via service property 'timeout' providing value in seconds

let config = {
    ... properties ...
}
let transactionService: PostFinanceCheckout.api.TransactionService = new PostFinanceCheckout.api.TransactionService(config);
transactionService.timeout = 15;

Integrating Webhook Payload Signing Mechanism into webhook callback handler

The HTTP request which is sent for a state change of an entity now includes an additional field state, which provides information about the update of the monitored entity's state. This enhancement is a result of the implementation of our webhook encryption mechanism.

Payload field state provides direct information about the state update of the entity, making additional API calls to retrieve the entity state redundant.

⚠️ Warning: Generic Pseudocode

> The provided pseudocode is intentionally generic and serves to illustrate the process of enhancing your API to leverage webhook payload signing. It is not a complete implementation. > > Please ensure that you adapt and extend this code to meet the specific needs of your application, including appropriate security measures and error handling. For a detailed webhook payload signing mechanism understanding we highly recommend referring to our comprehensive Webhook Payload Signing Documentation.

app.post('/webhook/callback', (req: Request, res: Response) => {
    const requestPayload: string = req.body;
    const signature: string | undefined = req.headers['x-signature'] as string;

    if (!signature) {
        // Make additional API call to retrieve the entity state
        // ...
    } else {
        if (webhookEncryptionService().isContentValid(signature, requestPayload)) {
            // Parse requestPayload to extract 'state' value
            // Process entity's state change
            // ...
        }
    }

    // Process the received webhook data
    // ...

});

License

Please see the license file for more information.