Sometimes, data that are to be submitted in the bank are not easily subject to a list of fields in the payment method settings. For example, the description field can serve as an identifier that needs to be calculated in an abstract way.
I was thinking that the module can allow the data to be altered right before the digest is calculated.
Throw a drupal_alter right before the digest is calculated.
Notice: Check https://developer.cardlink.gr/api-product/redirect/ under Digest Calculation in response message for the fields used for calculating the digest.
Needs work
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I am somewhat "afraid" of adding such functionality and I explain...
If we give the option to change all fields of this $data array, then it is possible for developers to break the digest validation mechanism I think - unintentionally at least. Maybe a change of the description field specifically? Or another way to disallow the manipulation of the data not-related to the digest?
I raise this first for D8+ and then we can backport it if required.