Add Environment Selection for Development and Production Modes

What's New

• Feature: Introduced an environment selection feature that allows users to specify whether to operate in Development (DEV) or Production (PROD) mode.

Details

• The constructor of the library now accepts an env parameter. If no value is provided, it defaults to PROD.
• This addition enhances flexibility, allowing developers to easily switch between development and production environments without modifying the library code.

Usage Example

To initialize the library in development mode:

VanillaPayInternational payment = new VanillaPayInternational(clientId, clientSecret, keySecret, vpiVersion, "DEV");