unzer-node-simple

Thin, incomplete wrapper around the Unzer payment API for Node.js.

This package nor the author are related in any way with Unzer.com (formerly known as Heidelpay). I highly recommend to checkout their official Node.js-SDK first and only use this package, when you run into trouble with the official one. You can use both packages simultaneously.

Why should you NOT use this package?

No support by Unzer (and no support by me)
You need to be familiar with the Unzer API reference
Functions do not validate/check data passed to them, you should know what you are doing.
The package offers only functions for stuff I need.

Why should you use this package?

The package has no external dependencies and is very lightweight.
You need to set/get data properties not covered by the official SDK
You want an easy way to handle retrieve URLs of webhook calls.

How to use this package?

Install the package via your favourite node.js package manager.

In general you set up a Unzer instance with your private sandbox or production key, then you pass that instance to one of the function modules:

const {UnzerSimple, Baskets, Customers} = require('unzer-node-simple');

const unzer = new UnzerSimple('<your-private-key-here>');

const basket = new Baskets(unzer);
const customer = new Customers(unzer);

The function modules are named after the corresponding sections in the Unzer API reference and/or URL routes. For example:

Baskets -> https://https://api.unzer.com/v1/baskets
Paypage -> https://https://api.unzer.com/v1/paypage

Also the methods in the function modules are direct representations of the REST API methods given in the reference. For example for https://docs.unzer.com/reference/api/#get-/v1/paypage/{id} and https://docs.unzer.com/reference/api/#post-/v1/paypage/charge

const {Unzer, Paypage} = require('unzer-node-simple');

const unzer = new UnzerSimple('<your-private-key-here>');
const paypage = new Paypage(unzer);

const get_result = await paypage.get('paypage_id');

const payload = {
    orderId : 'abc-123456-hi',
    amount : "100",
    currency : "EUR",
    returnUrl : "https://example.com/unzer/back",
    resources : {
        customerId : ...,
        basketId : ...,
        metadataId : ...
    }
};
const post_result = await paypage.charge(payload);

The method names usually follow the HTTP method ( post(), get(), put(), delete() ), or references the relevant URL part ( charge(), authorize() ). Parameter names are usually the same as in the Unzer API reference. If a method requires data for the HTTP body, that parameter is named payload (see example above) or named after the type of resource like customer.

The return value is always a Promise, that returns the decoded JSON data as plain old object after the call. The methods do not check the result for an Unzer error/success message. The only reason the methods throw an exception is an error with the underlaying HTTPS request.

Webhook handling

Somewhere at server start, register a webhook, if not already registered:

const {UnzerSimple, Webhooks} = require('unzer-node-simple');

const unzer = new UnzerSimple('<your-private-key-here>')
const webhooks = new Webhooks(unzer);

const result = await webhooks.isRegistered("https://example.com/unzer/notify", "all")
if(false === result) {
    await webhooks.post({url:"https://example.com/unzer/notify", event : "all"} );
}

Implement the webhook route and catch the message:

app.post("/unzer/notify", async function(req, res) {
    const message = JSON.parse(req.body);
    const details = await webhooks.getRetrieveUrl(message); // looks for message.retrieveUrl

    switch(message.event) {
        case 'charge.succeeded':
            enableNewSubscription(details);
            sendReceipt(details);
            break;
        case 'charge.failed':
            askForPaymentUpdate(details)
            break;
        case ...
    }

    res.status(200).end();
});

Generic usage

Aside of the function modules you can always call any API route via the Unzer object methods: get(), post(), delete(), put(). These methods will take care of the authentication via key, also the server name and api version: you need only to pass the correct url path.

const {UnzerSimple} = require('unzer-node-simple');

const unzer = new UnzerSimple('<your-private-key-here>');

const result = unzer.post('/types/my_method_id/recurring',
                    {some_body_data_1:..., other_body_data:....},
                    {'x-some-custom-header':'My header value'},
                    true)

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