You can confirm the IBAN validity using the following URL:
Note: SEPA Direct Debit cannot be performed with IBAN from countries outside the SEPA zone.
If it is correct, why does it not be accepted?
In order to reduce payment incident risks, SlimPay performs numerous validation processes before accepting an IBAN. These are auti-fraud rules.
If needed, do not hesitate to contact our customer service at firstname.lastname@example.org.