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Mollie API client for Python

Project description

Mollie API client for Python

Accepting iDEAL, Bancontact/Mister Cash, SOFORT Banking, Creditcard, SEPA Bank transfer, SEPA Direct debit, PayPal, Belfius Direct Net, KBC/CBC, Klarna Pay later/Pay now/Slice it, paysafecard, Giftcards, Giropay, EPS and Przelewy24 online payments without fixed monthly costs or any punishing registration procedures. Just use the Mollie API to receive payments directly on your website or easily refund transactions to your customers.

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To use the Mollie API client, the following things are required:

  • Get yourself a free Mollie account. No sign up costs.
  • Create a new Website profile to generate API keys and setup your webhook.
  • Now you're ready to use the Mollie API client in test mode.
  • Follow a few steps to enable payment methods in live mode, and let us handle the rest.
  • Python >= 3.7
  • Up-to-date OpenSSL (or other SSL/TLS toolkit)
  • Mollie API client for Python has a dependency on Requests and Requests-OAuthlib


Please note: If you are looking to install the v1 version of the Mollie API client, please refer to the v1-develop branch for installation instructions.

By far the easiest way to install the Mollie API client is to install it with pip. The command below will install the latest released version of the client.

$ pip install mollie-api-python

You may also git checkout or download all the files, and include the Mollie API client manually.

Create and activate a Python >= 3.7 virtual environment (inside a git checkout or downloaded archive).

$ cd mollie-api-python
$ python -m venv .venv
$ source .venv/bin/activate

Install the additional requirements for the examples, then install the Mollie API client itself.

$ pip install flask
$ pip install -e .

Run the examples.

export MOLLIE_API_KEY=test_YourApiKey
$ python examples/

If you are working from a development machine, you should use a tool like to get a publicly available URL that can be used in callback and redirect URLs. Start the service and expose the forwarding URL (https) to the mollie example code:

export MOLLIE_API_KEY=test_YourApiKey
$ python examples/

How to receive payments

To successfully receive a payment, these steps should be implemented:

  1. Use the Mollie API client to create a payment with the requested amount, currency, description and optionally, a payment method. It is important to specify a unique redirect URL where the customer is supposed to return to after the payment is completed.

  2. Immediately after the payment is completed, our platform will send an asynchronous request to the configured webhook to allow the payment details to be retrieved, so you know when exactly to start processing the customer's order.

  3. The customer returns, and should be satisfied to see that the order was paid and is now being processed.

Find our full documentation online on

Getting started

Importing the Mollie API Client

from mollie.api.client import Client

Initializing the Mollie API client, and setting your API key

mollie_client = Client()

Creating a new payment.

payment = mollie_client.payments.create({
    'amount': {
        'currency': 'EUR',
        'value': '10.00' 
    'description': 'My first API payment',
    'redirectUrl': '',
    'webhookUrl': '',

After creation, the payment id is available in the property. You should store this id with your order.

After storing the payment id you can send the customer to the checkout using the payment.checkout_url.

For a payment create example, see Example 1 - New Payment.

In general, request body parameters for an API endpoint should be added to a dictionary and provided as the first argument (or data keyword argument). Query string parameters can be provided as keyword arguments.

Retrieving payments

We can use the to retrieve a payment and check if the payment isPaid.

payment = mollie_client.payments.get(

if payment.is_paid():
    print('Payment received.')

Or retrieve a collection of payments.

payments = mollie_client.payments.list()

For an extensive example of listing payments with the details and status, see Example 5 - Payments History.

Payment webhook

When the status of a payment changes the webhookUrl we specified in the creation of the payment will be called.
There we can use the id from our POST parameters to check te status and act upon that, see Example 2 - Webhook verification.


Since the 2.0 version of the API (supported by version 2.0.0 of the client) non-EUR payments for your customers is now supported. A full list of available currencies can be found in our documentation.

payment = mollie_client.payments.create({
    'amount': {
        'currency': 'USD', 
        'value': '10.00'
    'description': 'Order #12345',
    'redirectUrl': '',
    'webhookUrl': '',

After the customer completes the payment, the payment.settlement_amount will contain the amount + currency that will be settled on your account.

Fully integrated iDEAL payments

If you want to fully integrate iDEAL payments in your web site, some additional steps are required. First, you need to retrieve the list of issuers (banks) that support iDEAL and have your customer pick the issuer he/she wants to use for the payment.

Retrieve the iDEAL method and include the issuers

method = mollie_client.methods.get(mollie.api.objects.Method.IDEAL, include='issuers')

method.issuers will be a list of Issuer objects. Use the property id of this object in the API call, and the property name for displaying the issuer to your customer. For a more in-depth example, see Example 4 - iDEAL payment.

payment = mollie_client.payments.create({
    'amount': {
        'currency': 'EUR', 
        'value': '10.00'
    'description': 'My first API payment',
    'redirectUrl': '',
    'webhookUrl': '',
    'method': mollie.api.objects.Method.IDEAL,
    'issuer': selectedIssuerId,  # e.g. "ideal_INGBNL2A"

The payment.checkout_url is a URL that points directly to the online banking environment of the selected issuer.

Refunding payments

The API also supports refunding payments. Note that there is no confirmation and that all refunds are immediate and definitive. Refunds are only supported for iDEAL, credit card, Bancontact, SOFORT Banking, PayPal, Belfius Direct Net, KBC/CBC, ING Home'Pay and bank transfer payments. Other types of payments cannot be refunded through our API at the moment.

payment = mollie_client.payments.get(

# Refund € 2 of this payment
refund = mollie_client.refunds.on(payment).create({
    'amount': {
        'currency': 'EUR',
        'value': '2.00'

For a working example, see Example 11 - Refund payment.


At the oauth process is explained. Please read this first.

Oauth authentication process redirects back to your application. Therefore you should expose your local web server (the examples) as public urls. A webservice like can help you with that. Make sure to set REDIRECT_URI accordingly.

Run the oauth2 examples:

export MOLLIE_CLIENT_ID=your_client_id
export MOLLIE_CLIENT_SECRET=your_client_secret
python examples/oauth/

The Authorize endpoint is the endpoint on the Mollie web site where the merchant logs in, and grants authorization to your client application. E.g. when the merchant clicks on the Connect with Mollie button, you should redirect the merchant to the Authorize endpoint.

The resource owner can then grant the authorization to your client application for the scopes you have requested.

Mollie will then redirect the resource owner back to the redirect_uri you have specified. The redirect_uri will be appended with a code parameter, which will contain the auth token. At the redirect_uri, you should extract that token, and use it to request a regular oauth token.

Initializing via oauth2

You should implement the get_token and set_token methods yourself. They should retrieve and store the oauth token that is sent from Mollie somewhere in your application (f.i. in the database).

The token data is a python dict.

These are example methods, you should use a storage method that fits your application.

def get_token():
    :return: token (dict) or None
    if os.path.exists('token.json'):
        with open('token.json', 'r') as file:
            return json.loads(

def set_token(token):
    :param token: token (dict)
    :return: None
    with open('token.json', 'w') as file:

mollie_client = Client()
is_authorized, authorization_url = mollie_client.setup_oauth(
# When "is_authorized" is False, you need to redirect the user to the authorization_url.

# After the user confirmed she is redirected back to your redirect_uri.
# The view on this uri should call setup_oauth_authorization_response(), with authorization_response as parameter.
# This is the full callback URL (string)


# The token will be stored via your `set_token` method for future use. Expired tokens will be refreshed by the client automatically.

# Now You can query the API:


API documentation

If you wish to learn more about our API, please visit the Mollie Developer Portal. API Documentation is available in English.

Want to help us make our API client even better?

Want to help us make our API client even better? We take pull requests, sure. But how would you like to contribute to a technology oriented organization? Mollie is hiring developers and system engineers. Check out our vacancies or get in touch.


BSD (Berkeley Software Distribution) License. Copyright (c) 2014-2020, Mollie B.V.


Contact: — +31 20 820 20 70

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