The BCP 47-formatted locale of pages that the PayPal payment experience shows.
PayPal supports a five-character code. For example, da-DK, he-IL, id-ID,
ja-JP, no-NO, pt-BR, ru-RU, sv-SE, th-TH, zh-CN, zh-HK, or zh-TW.
Provides additional details to process a payment using a payment_source that
has been stored or is intended to be stored (also referred to as
stored_credential or card-on-file).
Parameter compatibility: