Module validation 

A trait that defines validation methods for a payment request.

This trait is used to ensure that the PaymentRequest object contains valid data before processing. It provides methods to validate:

• The payment amount must be greater than zero.
• The currency code must be a valid 3-letter ISO 4217 string.
• The customer ID, if provided, must not be empty.

Traits

ValidatableRequest

This trait is used to ensure that the PaymentRequest object contains valid data before processing.