In case anyone found this unresolved issue and has the same problem: The API Documentation seems to be off. If you provide an Address like this its working: purchase_units: [{ ........... shipping: { address: { "address_line_1": "<removed>", "address_line_2": "<removed>", "admin_area_2": "San Francisco", "admin_area_1": "CA", "postal_code": "<removed>", "country_code": "US" }, }, }]
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