put https://api.fastspring.com/quotes/
The PUT /quotes/{id} endpoint updates an open quote with the attributes you provide in the request. You must include all attributes in the request, otherwise, they will either be cleared or reset to default values.
USA and Canada: To allow FastSpring to accurately calculate taxes in the USA and Canada a valid postal code is mandatory (postal code is optional in all other countries). You can also optionally enter a valid region name or code, but it must match the postal code region. If the “region” field is left empty, it will be populated with the region associated with the postal code.