As a shop owner, I want to know the meaning of payment decline codes in payment declined emails

[jimmyedagawa78]

Is your feature request related to a problem? Please describe. As a shop owner, when I receive payment declined emails, I want to learn about the meaning of payment decline codes.

Describe the solution you'd like I would like to learn about the payment decline codes in Subscribie's docs

Additional context This is in relation to adding additional documentation to Subscribie's docs