Automatically calculate a structured communication (Paiement communication in Belgium - Equivalent exist for EU)

Automatically calculate a structured communication (Paiement communication in Belgium - Equivalent exist for EU): What version of Invoice Ninja are you running? V5 What environment are you running? Self hosted (cpanel) Additional context Add any other context about the request/question here. How is it calculate : Format on paper: from left to right 3 “+”, the structured message (3 digits and 1 slash, 4 digits and 1 slash and 5 digits (of which the last 2 digits form the check digit)) and 3 “+” ( +++123/1234/12345+++) Digital format: 12 digits (123456789012). Check digit calculation : The check digit is the...