Create global payments integration

[sanu499]

Implement a global payments feature in the paymentwall-java SDK to support international transactions.

Requirements:

• Research and define architecture to support multiple payment providers and currencies
• Implement abstractions for different payment gateways
• Ensure compliance with global payment regulations (e.g., PCI-DSS)
• Provide integration tests for major regions (NA, EU, APAC)
• Update documentation to explain how to use the new global payments feature

[sanu499]

1. Create global payments integration #16 (comment)

[sanu499]

#16 (comment) is nice and work easy.