Why it happens
- A domestic transaction was disputed under rules specific to that country.
Mastercard4999Customer dispute
Used only in Europe, for disputes between an issuer and an acquirer in the same country under local rules. The reason behind it depends on the domestic rules of that country.
Summaries written by NoChurn from the networks’ public rules and processor documentation. Networks update their rules and deadlines depend on your processor: check its documentation before you respond.
Read https://www.nochurn.sh/llms.txt,
then follow https://www.nochurn.sh/docs/quickstart/
to add NoChurn to this app. Use a test key
(nc_test_…) until I say we go live.