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billwerk is a member of the Mollie partner program and currently supports SEPA direct debit and credit card payments through Mollie.


  • In your Mollie account, activate the payment methods you want to use in billwerk.
    For more information, see the Mollie documentation.
  • Please be aware before starting your implementation of SubscriptionJS on your sign up page, that all of the proposed payment methods of this PSP support the ProcessPaymentData method:

    Payment Method

    ProcessPaymentData method supported

    Credit Card with 3D Secure


    Direct Debit




Configuring Mollie integration

  • In order to receive money from payments, your account and profile need to be verified by Mollie.
  • In order to test your Mollie setup, you can set the transaction mode in your Mollie settings in billwerk to test. This way, all transactions that are triggered through billwerk (Sandbox) are registered as test transactions by Mollie and will not lead to actual payments.
  • If you want to use the iDeal payment method, you must also activate the Direct Debit payment method in billwerk.
  • If you use the iDeal payment method, the minimum payment amount is 0.01. Therefore, trials or free orders are not possible.

billwerk can be used with Mollie via Mollie Connect.

  1. To get to the Payment Settings, click on your email address > Settings in the top right corner.
  2. In the PAYMENTS section, click Payment Settings.
  3. In the Mollie row, click the mceclip0.png icon.
  4. Click the Connect via Mollie button.
  5. Log in to your Mollie account. If you do not have a Mollie account yet, you can sign up.
    Mollie will show you which of your account’s Mollie-data will be shared with billwerk in order to set up the connection.
    For more information on getting started with Mollie, see the Mollie documentation.
  6. Click the Allow access button.

  7. Select the profile you want to use with billwerk.



  • SEPA Direct Debit is limited to 1.000 EUR per transaction. This limit can be raised up to 5.000 EUR through Mollie support.
    For more information, see the Mollie documentation.
  • Credit Card payments are limited to 10.000 EUR per transaction.
    For more information, see the Mollie documentation.
  • Refunds require a sufficient amount in your Mollie account.
    For more information, see the Mollie documentation.


Configuring SEPA reference line

You can configure the SEPA reference line manually. For more information, see the article Configuring SEPA reference.

Test data

Credit Card

American Express

Card Number 378282246310005
Expiry Date any
CVC any



Card Number 2223000010479399
Expiry Date any
CVC any



Card Number 4543474002249996
Expiry Date any
CVC any

If you are looking for additional test data, you can find the full list in the official Mollie documentation.


Contact data

Mollie support:

Call +31 20 820 20 70


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