So, Sumup support have now told me twice via email and once via phone call that Monzo cards are not accepted on Sumup, and that this is a “recent development”, so just a warning that you may get the same nonsense if anyone else else tries to report it as a merchant.
Anyway, I kept at them, and they finally acknowledged that they do indeed support Monzo cards, they can see the failures that we were experiencing, and they’re going to escalate it to their transactions team and keep me updated.
In case anyone is interested in a refresher, their relevant obligations with Mastercard include the following:
5.11 Merchant Obligations for Acceptance
5.11.1 Honor All Cards
In the Europe Region, the Rule on this subject is modified as follows.
EEA, Serbia, Bosnia and Herzegovina, North Macedonia, Kosovo, Gibraltar, and
the United Kingdom
The following Rules apply with respect to acceptance by Merchants in the EEA, Serbia, Bosnia
and Herzegovina, North Macedonia, Kosovo, Gibraltar, and the United Kingdom, of Cards issued
in the EEA, Serbia, Bosnia and Herzegovina, North Macedonia, Kosovo, Gibraltar, and the United
Kingdom.
- A Merchant that accepts Mastercard Credit Cards must accept all Mastercard Credit Cards
issued in the EEA, Serbia, Bosnia and Herzegovina, North Macedonia, Kosovo, Gibraltar, and
the United Kingdom.
- A Merchant that accepts Mastercard Debit Cards, including Debit Mastercard Cards, must
accept all Mastercard Debit Cards issued in the EEA, Serbia, Bosnia and Herzegovina, North
Macedonia, Kosovo, Gibraltar, and the United Kingdom.
Europe Region
5.8.2 Acceptor Address Information
©1969–2023 Mastercard. Proprietary. All rights reserved.
Mastercard Rules • 6 June 2023 265
- A Merchant that accepts Mastercard Prepaid Cards must accept all Mastercard Prepaid
Cards issued in the EEA, Serbia, Bosnia and Herzegovina, North Macedonia, Kosovo,
Gibraltar, and the United Kingdom
I’ll update again when I have anything more to share.
We’re back on the Zettle card reader for now.