The details you send as part of the POST/api/order method in the delivery_address field of the recipient_details field.

FieldDescription
address_line_1Line 1 of the address field
address_line_2Line 2 of the address field
suburbThe suburb or town of the address
stateThe state or providence of the address
postcode_zipcodeThe postcode or zipcode of the address
countryThe country of the address as the full country name eg Australia, England, Singapore etc