Hello Stefan, I have the same problem, but changing the invoicer's name, surname and email to the one on the business paypal account did not sort it out. I do the API call in Python with the request library. My data dictionary looks like this, I can print it, so syntactically everything should be fine. {'detail': {'invoice_date': '2021-08-19', 'currency_code': 'EUR', 'note': 'Danke für Ihren Einkauf!', 'term': 'Rückerstattungen bis 2 Werktage vor Termin'}, 'invoicer': {'name': {'given_name': 'Max', 'surname': 'Mustermann'}, 'address': {'address_line_1': 'Test Str. 20', 'address_line_2': 'Etage 2', 'admin_area_2': 'Teststadt', 'admin_area_1': 'BY', 'postal_code': '12345', 'country_code': 'DE'}, 'email_address': 'mail thats used in the paypal business account', 'phones': [{'country_code': '0049', 'national_numer': '1711433650', 'phone_type': 'MOBILE'}], 'website': 'www.lernwelt.de'}, 'primary_recipients': [{'billing_info': {'name': {'given_name': 'Patrick', 'surname': 'Zauner'}, 'address': {'address_line_1': 'Freibierstraße 2', 'admin_area_2': 'Teststadt', 'postal_code': '12345', 'country_code': 'DE'}, 'email_address': 'buyers mail'}, 'shipping_info': {'name': {'given_name': 'Patrick', 'surname': 'Zauner'}, 'address': {'address_line_1': 'Freibierstraße 2', 'admin_area_2': 'Teststadt', 'postal_code': '12345', 'country_code': 'DE'}}}], 'items': [{'name': 'Nachhilfestunde', 'description': '2. Klasse, Mathe, Kommentar: Addition und Subtraktion bis 100', 'quantity': '1', 'unit_amount': {'currency_code': 'EUR', 'value': '10.00'}, 'unit_of_measure': 'QUANTITY'}]} Do you have any idea why I still get an INVALID_REQUEST back ? {'name': 'INVALID_REQUEST', 'message': 'Request is not well-formed, syntactically incorrect, or violates schema.', 'debug_id': '95555fd4d8d2c', 'details': [], 'links': [{'href': 'https://developer.paypal.com/docs/api/invoicing/#errors', 'method': 'GET'}]} kind regards, Patrick
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