A parallel payment is a payment from a sender that is split directly among 2 to 6 receivers.
Technically, a parallel payment is a set of multiple payments made in a single Pay request.
Parallel payments are useful in cases when a buyer intends to make a single payment for items
from multiple sellers. Examples include the following scenarios:
1) single payment for multiple items from different merchants, such as a combination of
items in your inventory and items that are drop-shipped by partners.
2) purchases of items related to an event, such as a trip that requires airfare, car rental, and a
hotel booking.
In these cases, the sender knows the receivers and the amount paid to each one.

Chained Payments
A chained payment is a payment from a sender that is indirectly split among multiple
receivers. It is an extension of a typical payment from a sender to a receiver; however, a
receiver, known as the primary receiver, passes part of the payment to other receivers, who are
called secondary receivers.