What does “RefusedByProvider” transaction state mean?

The card issuer has rejected the transaction and the cardholder has to contact their issuing bank to get the exact reason for the rejection.

The information that we get from the issuing banks are detailed here: Card deposit provider response codes

Mastercard and Visa send decline reason codes where merchants can decide on best next steps.

Mastercard: MasterCard Decline Reason Code Service

Visa: Visa Decline Codes and Categories