feat(apple_pay): add support for decrypted apple pay token for checkout

[ShankarSinghC]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

This pr is to add support for decrypted apple pay token for checkout so that apple pay payments can be made using simplified apple pay flow.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

simplified flow


manual_flow

Test case :-
Pass the below metadata in the connector create
Manual flow

"metadata": {
        "apple_pay_combined": {
            "manual": {
                "session_token_data": {
                    "initiative": "web",
                    "certificate": "certificate",
                    "display_name": "checkoutapple",
                    "certificate_keys": "certificate_keys",
                    "initiative_context": "initiative_context",
                    "merchant_identifier": "merchant_identifier"
                },
                "payment_request_data": {
                    "label": "applepay",
                    "supported_networks": [
                        "visa",
                        "masterCard",
                        "amex",
                        "discover"
                    ],
                    "merchant_capabilities": [
                        "supports3DS"
                    ]
                }
            }
        }
    }

Simplified flow

"metadata": {
        "apple_pay_combined": {
            "simplified": {
                "session_token_data": {
                    "initiative_context": "initiative_context"
                },
                "payment_request_data": {
                    "label": "applepay",
                    "supported_networks": [
                        "visa",
                        "masterCard",
                        "amex",
                        "discover"
                    ],
                    "merchant_capabilities": [
                        "supports3DS"
                    ]
                }
            }
        }
    }

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[srujanchikke]

LGTM!

[Sangamesh26]

LGTM :)