This refers to the version of the request payload schema.

The value of the original authorization identification number returned by a PayPal product.

If you are voiding a transaction that has been reauthorized, use the ID from the original authorization, and not the reauthorization.

Required

Character length and limits: 19 single-byte characters

An informational note about this settlement that is displayed to the payer in email and in transaction history.

Optional

Character length and limits: 255 single-byte characters

Unique id for each API request to prevent duplicate payments.

Optional
Character length and limits: 38 single-byte characters maximum.