SlimPay

About this Module

We added this module in WHMCS 7.2 and removed it in WHMCS 8.8.

SlimPay is a Direct Debit payment gateway supporting both BACS Direct Debit for UK based customers and SEPA for EU based customers. Direct Debit is a pull-based bank-to-bank payment method: a customer authorises a merchant to automatically debit their bank account of the amount of the subscription.

Direct debit is not an instant payment service. Payment processing may require multiple days.

Supported Features

Type	One Time	Recurring	Refunds	Reversals
3rd Party	Yes	Yes	Yes	Yes

Adding the SlimPay Payment Gateway

To set up the SlimPay payment gateway in WHMCS:

Go to the appropriate location for your version of WHMCS:
- For WHMCS 8.0 and later, go to Configuration () > Apps & Integrations or Addons > Apps & Integrations.
- For WHMCS 7.10 and earlier, go to Setup > Products/Services > Payment Gateways and choose All Payment Gateways.
Click SlimPay.
Check Show on Order Form to display this payment method in the Client Area during checkout.
Enter your SlimPay credentials.
Click Save Changes.
In SlimPay, set the return URL to https://www.example.com/path/to/whmcs/modules/gateways/callback/slimpay.php, where https://www.example.com/path/to/whmcs/ is the URL to your WHMCS installation.

Watch the video tutorial for this feature

Test Mode

You can use sandbox mode to simulate payment processing without actually causing a transaction to occur. This can be useful to test your configuration.

Instant Activation for New Orders

Direct debit is not an instant payment service. Payments can take up to a few days to clear and fully complete processing.

If you wish to provision new orders immediately upon the completion of a mandate agreement and initiating of a payment, to avoid the customer having to wait while the payment clears, check Instant Activation for New Orders in the SlimPay payment gateway settings. This will trigger the invoice to be marked paid and any successful payment automation actions to be carried out immediately.

Supported Currencies

SlimPay supports payments in Euro and British Pounds. The module will automatically select the appropriate BACS or SEPA payment method based on the currency of the invoice.

Payment Workflow

The first time a user pays an invoice using the SlimPay payment gateway, they will be asked to complete a mandate that authorizes you (the merchant) to debit their bank account automatically each subscription cycle. The customer only has to do this once.

Upon creation of a mandate for the first time, a payment request will be initiated. Until such time as the payment has fully completed, the invoice will display a "Payment Pending" status and display a message to the user as shown below. No automated provisioning actions will be performed until the payment has fully cleared, unless you enable the Instant Activation for New Orders option.

For recurring invoices where a mandate agreement already exists between you and the customer, WHMCS will automatically request a payment capture on the due date of the invoice.

Rejected Payments

The SEPA scheme allows an eight week period where a payment received can be rejected or reversed by the payee. WHMCS will monitor for any changes in the payment status of invoices paid via SlimPay during this time and will automatically process these as appropriate.

For more information, see Payment Reversals.