Sender-created ID for tracking the batch payout in an accounting system. 30 characters max.
The subject line text for the email that PayPal sends when a payout item is completed. (The subject line is the same for all recipients.) Maximum of 255 single-byte alphanumeric characters.
The type of ID for a payment receiver. If this field is provided, the payout items without a `recipient_type` will use the provided value. If this field is not provided, each payout item must include a value for the `recipient_type`.