Add ability to add custom prefix for payment, refund, IIA

[abhishek_grover]

We already have the ability to change the prefix for Invoice Numbers.

We should have the ability to do the same for all other transactions as well ->

Payment, Refund, IIA.

This is especially useful in test environments, and when syncing the transactions with other systems, which might already have old historical data. We see a lot of clashes that lead to manual work.

[Alexis]

The ability to configure prefixes and starting numbers for payments and refunds will soon be supported. Prefixes for IIAs will not be supported.

[Alexis]

Currently in Zuora, prefix and numbering configuration for payments and refunds is supported. 

If no prefix is defined for payments or refunds in a sequence set, the payments and refunds created will adopt the default payment prefix P- and the default refund prefix R-.

To learn more about managing payment and refund prefixes and starting numbers see Prefix and Numbering configuration for more information.