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I think you didn't understand exactly what i need. I already have custom fields and showing on invoice and everything. I want this field to show specifically at the admin invoice view page at the summary tab. Please see the screenshots Thanks

Thank you so much. The problem ist that i don't have enough coding skills to do that. can you help me with a code example?

Hi, i was wondering if there is a way to add an extra field at the admin invoice view page at the summary tab. Or if this is not possible anywhere in this page. I want to add Vat id and perhaps email under client name. See attached screenshot. example: Thanks in advance