Resolved. We checked the whole flow with a test payment at Mollie: the payment is reported and assigned correctly. There were no paid Mollie top-ups that went uncredited, so nobody lost any balance.

The fix is live: after paying via Mollie you now come back with your payment number, and Mollie also reports every payment directly to us. So the balance is credited even if you close the window early. We are watching the next Mollie payments. Earlier payments that were not credited will be booked by hand.

Cause found: after paying, Mollie sends you back without a payment number, and Mollie's automatic notification to us was not set up. So we did not know which payment to book.

The fix is ready. Until it is live, please top up via Stripe or PayPal. Mollie top-ups that were already paid will be credited by hand.

If you top up via Mollie, the page shows "No payment reference" after paying and the balance does not appear. Top-ups via Stripe and PayPal work normally.

We are looking into it. No money is lost: every payment is recorded at Mollie and will be credited. If you are affected, you don't need to do anything. If you like, open a ticket with the time of the payment.