I representing one of your customer.
They want to offer their customers to pay their invoices via Bankgiro by using OCR-numbers. Today they transfer all their invoices from their internal system to e-conomic. When the invoice is created in e-conomic it's also booked so they can set the order number created in their system.
When the customer pays the invoice with Bankgiro they will use the OCR-number printed on the invoice. To import the payment file from their bank into e-conomic one requirement, from your side, is that the OCR-number need to be generated in e-conomic. I contacted the customer service in Sweden and they told me that the OCR-number is the invoice number plus a three digit checksum. If this is correct we can still book the invoices with the internal order number, but I need to know how to get the last three digits. Is there any API method I can use to get this information?