identifierstring - A string used to uniquely identify a discount offer for a product.
keyIdentifierstring - A string that identifies the key used to generate the signature.
noncestring - A universally unique ID (UUID) value that you define.
signaturestring - A UTF-8 string representing the properties of a specific discount offer, cryptographically signed.
timestampnumber - The date and time of the signature's creation in milliseconds, formatted in Unix epoch time.