Create an invoice link

Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.

sum of all items must match breakdown.item_total if provided

sum of entries in breakdown must equal amount

Duration in seconds for which invoice will be valid and payable

Set of key-value pairs in the format of string. This is attached to the invoice object for storing additional information.

User to bill the invoice to