Changes to List Prices

the response property items/duration became nullable for the status 200

the response property items/interval became nullable for the status 200

the response property items/interval_count became nullable for the status 200

the response property items/trial_duration became nullable for the status 200

the response property items/trial_interval became nullable for the status 200

the items/duration response's property type changed from string to integer null for status 200

the items/interval_count response's property type changed from string to integer null for status 200

the items/trial_duration response's property type changed from string to integer null for status 200

added the new undefined enum value to the items/payment_type response property for the response status 200

added the new optional query request parameter per_page

for the path request parameter product_id, the type was generalized from integer to string

added the non-success response with the status 422

added the optional property hint to the response with the 401 status

added the optional property hint to the response with the 404 status