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New Validation for VAT-number

Changes to endpoints
https://apps.fortnox.se/apidocs#tag/CustomersResource
What
We have added a check in the field for VAT-number to control that the entered value is a valid VAT-number.
Why
The reason to why we have added this check is to help the customer to enter the right information.
Impact
This means that it is no longer possible to save the entered value on the customer card if the VAT-number is not valid.