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Checkout: a comprehensive payment interface




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Checkout: a comprehensive payment interface


The SlimPay Checkout module allows users to sign direct debit mandates electronically for the following schemes:

  • SEPA Core
  • SEPA B2B

SlimPay has developed standard direct debit mandate templates in PDF format for both schemes.  These templates are compliant with SEPA rulebooks and EPC guidelines. 

mandat_B2B.png mandat.png

Responsive design

The SlimPay Checkout module is responsive. It is compatible with tablets, smartphones and any screen size, with the UI automatically adapting to the type of device used. This creates a genuine multi-channel experience.



The SlimPay Checkout module is designed to work with multiple languages. The languages currently available are: EN (English), DE (German), ES (Spanish), FR (French), IT (Italian), NL (Dutch), PT (Portuguese) and Polish (PL). 

The Checkout language is selected with the following criteria:

  1. The SlimPay Checkout call (API ‘locale’ parameter in #create-orders)
  2. The ‘Accept-Language’ header (language parameter chosen by the subscriber’s browser, provided it is one of the languages supported by the Checkout as indicated above)
  3. The merchant account settings
  4. By default (English)


Multi-creditor mode is used by large groups with various legal entities. Each legal entity will be declared in the SlimPay solution as a creditor with an individual SEPA creditor identifier (CID)

All data for each subsidiary will be separated from one another. SlimPay also offers the option to create global users with the required rights to consult/amend the information on each of the subsidiaries. As such, the dedicated users for each entity will only be able to consult the data from their entity, while a global user will have the necessary rights to access all subsidiary data.


Multiple merchant websites

With SlimPay, a merchant can use as many websites as necessary. For each of its websites, a merchant can determine:

  • API identifiers
  • a notification URL
  • a return URL
  • a logo

NB: SlimPay also allows users to create global API identifiers in order to access various merchant accounts.

SlimPay offers various website integration options:

  • Option 1: Overlay mode (or Pop-in mode)
  • Option 2: iFrame mode (or embedded mode)
  • Option 3: Redirect mode 

=> Watch a video of a Checkout integrated in 'pop-in iFrame mode' here.

=> Watch a video of a Checkout integrated in 'embedded iFrame mode' here



SlimPay’s electronic signature module is a solution adapted to the needs of various sales channels:

  • Web or mobile: the SlimPay Checkout can easily interface with an online portal
  • Call centre: the SlimPay Checkout can easily integrate into a Call Centre solution to sign SEPA mandates remotely via an operator
  • Face to face: signature in an office or branch (e.g. gym reception or enrolment terminal)
  • Mobile: signature on a tablet in roaming mode

The different ways of calling the Checkout

There are various ways of calling our Checkout. All these calls will be in redirect integration mode.

Signature via link

Via the API 

If you integrate our API, you can call our Checkout from the API itself with the create-orders call. This will send an email to your debtor with a link to the Checkout. 

Via the Dashboard

If you haven’t integrated our API, you can use our Dashboard. 

Once the signature link submission form has been completed with your debtor’s information, an email will be automatically sent to the email address provided. Your customer can then click the link and be redirected to our Checkout.

Via file

Creating a file optimises completion of the link submission form by sending multiple links at once.

You create your file with all the required information and import it into your Back Office or SFTP. Once the file has been processed, an email is sent to your debtors who click the link to be directed to the Checkout.

Signature by an operator

Via the Dashboard

If you haven’t integrated our API, you can use our Dashboard. 

Once the operator signature form has been completed with your debtor’s information, the Checkout will appear on your Dashboard and it will then be up to you to browse the various pages on behalf of your debtor.


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