The amount to charge to the customer.

Required

Only numeric characters and a decimal separator are allowed. Limit: 10 single-byte characters, including two for decimals You must set the currencyID attribute to one of the three-character currency code for any of the supported PayPal currencies.

Preapproved Payments billing agreement identification number between the PayPal customer and you.

Required

Character limit: 19 single-byte alphanumeric characters.

The format of a billing agreement identification number is the single-character prefix B, followed by a hyphen and an alphanumeric character string:

B-unique_alphanumeric_string

Specifies type of PayPal payment you require

Optional

Text entered by the customer in the Note field during enrollment

Optional

Subject line of confirmation email sent to recipient

Optional

The tax charged on the transaction

Optional

Per-transaction shipping charge

Optional

Per-transaction handling charge

Optional

Name of purchased item

Optional

Reference number of purchased item

Optional

Your invoice number

Optional

Custom annotation field for tracking or other use

Optional

An identification code for use by third-party applications to identify transactions.

Optional

Character length and limitations: 32 single-byte alphanumeric characters

Passed in soft descriptor string to be appended.

Optional

Character length and limitations: single-byte alphanumeric characters