After looking in Moneybird custom fields data does not appear to be filled in the invoice.
Building the invoice resource by hand, it does fill the custom_fields attribute but when calling the to_json method on the resulting object it gets serialised as custom_fields instead of custom_fields_attributes and ignored by Moneybird API.
reproduce:
After looking in Moneybird custom fields data does not appear to be filled in the invoice.
Building the invoice resource by hand, it does fill the custom_fields attribute but when calling the to_json method on the resulting object it gets serialised as custom_fields instead of custom_fields_attributes and ignored by Moneybird API.
I guess we have to add a custom_field resource to solve this problem.