Explanation calculated hash values and the transmitted hash values do not coincide.

Possible causes (several possibilities):

• A parameter for the calculation method hasn't been set up correctly (global security parameter; not the same settings in the shop back-end as in the PSP's back-end).
• The signatures in the shop back-end do not correspond to those of the Payment Service Provider's back-end.
• The PSP ID has not been entered identically as shown in the one of the PSP. The PSP ID is case sensitive.