fix(routing): do not update perform_session_flow_routing output if the SessionRoutingChoice is none

[ShankarSinghC]

Type of Change

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

Description

While performing the session token routing we create an empty vec that will contain the Routing choices for that particular session. In case if there is no connectors that requires session call then the perform_session_flow_routing will return the empty vec. Instead if there is no connectors that requires session call, then we should just return empty hashmap.

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?

-> Create mca for stripe with apple pay, google pay and klarna

{
    "connector_type": "fiz_operations",
    "connector_name": "stripe",
    "connector_account_details": {
        "auth_type": "HeaderKey",
        "api_key": ""
    },
    "test_mode": true,
    "disabled": false,
    "payment_methods_enabled": [
        {
            "payment_method": "card",
            "payment_method_types": [
                {
                    "payment_method_type": "credit",
                    "payment_experience": null,
                    "card_networks": [
                        "Visa",
                        "Mastercard"
                    ],
                    "accepted_currencies": null,
                    "accepted_countries": null,
                    "minimum_amount": -1,
                    "maximum_amount": 68607706,
                    "recurring_enabled": true,
                    "installment_payment_enabled": true
                },
                {
                    "payment_method_type": "debit",
                    "payment_experience": null,
                    "card_networks": [
                        "Visa",
                        "Mastercard"
                    ],
                    "accepted_currencies": null,
                    "accepted_countries": null,
                    "minimum_amount": -1,
                    "maximum_amount": 68607706,
                    "recurring_enabled": true,
                    "installment_payment_enabled": true
                }
            ]
        },
        {
            "payment_method": "wallet",
            "payment_method_types": [
                {
                    "payment_method_type": "apple_pay",
                    "payment_experience": "invoke_sdk_client",
                    "minimum_amount": 1,
                    "maximum_amount": 68607706,
                    "recurring_enabled": true,
                    "installment_payment_enabled": true
                },
                {
                    "payment_method_type": "google_pay",
                    "payment_experience": "invoke_sdk_client",
                    "minimum_amount": 1,
                    "maximum_amount": 68607706,
                    "recurring_enabled": true,
                    "installment_payment_enabled": true
                }
            ]
        },
        {
            "payment_method": "pay_later",
            "payment_method_types": [
                {
                    "payment_method_type": "klarna",
                    "payment_experience": "redirect_to_url",
                    "card_networks": null,
                    "accepted_currencies": null,
                    "accepted_countries": null,
                    "minimum_amount": 1,
                    "maximum_amount": 68607706,
                    "recurring_enabled": true,
                    "installment_payment_enabled": true
                }
            ]
        }
    ],
    "metadata": {
        "apple_pay_combined": {
            "manual": {
                "session_token_data": {
                    "initiative": "web",
                    "certificate": "==",
                    "display_name": "applepay",
                    "certificate_keys": "",
                    "payment_processing_details_at": "Hyperswitch",
                    "payment_processing_certificate": "",
                    "payment_processing_certificate_key": "",
                    "initiative_context": "sdk-test-app.netlify.app",
                    "merchant_identifier": "",
                    "merchant_business_country": "US"
                },
                "payment_request_data": {
                    "label": "applepay",
                    "supported_networks": [
                        "visa",
                        "masterCard",
                        "amex",
                        "discover"
                    ],
                    "merchant_capabilities": [
                        "supports3DS"
                    ]
                }
            }
        },
        "google_pay": {
            "merchant_info": {
                "merchant_name": "Stripe"
            },
            "allowed_payment_methods": [
                {
                    "type": "CARD",
                    "parameters": {
                        "allowed_auth_methods": [
                            "PAN_ONLY",
                            "CRYPTOGRAM_3DS"
                        ],
                        "allowed_card_networks": [
                            "AMEX",
                            "DISCOVER",
                            "INTERAC",
                            "JCB",
                            "MASTERCARD",
                            "VISA"
                        ]
                    },
                    "tokenization_specification": {
                        "type": "PAYMENT_GATEWAY",
                        "parameters": {
                            "gateway": "stripe",
                            "stripe:version": "2018-10-31",
                            "stripe:publishableKey": "pk_test_51Msk2GAGHc77EJXX78h549SX2uaOnEkUYqBfjcoD05PIpAnDkYxMn8nQ4d19im85NQuX4Z6WDyHaUw2fFTPBWsIY00Wa7oNerO"
                        }
                    }
                }
            ]
        }
    }
}

-> Also enable klarna via klarna
-> Now configure volume based routing for the connector
-> Create a payment and make a session call

curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_1l8FEkupRHGMJp9gZyj9HDUwgsSgAVgiKjtvdiDfocYs5Gjo2cn3UTpjNTBzYRHH' \
--data '{
  "amount": 10000,
  "currency": "USD",
  "capture_method": "automatic",
  "authentication_type": "no_three_ds",
  "confirm": false,
  "customer_id": "cu_1720854397"
}'

curl --location 'http://localhost:8080/payments/session_tokens' \
--header 'Content-Type: application/json' \
--header 'x-browser-name: Safari' \
--header 'x-client-platform: web' \
--header 'x-merchant-domain: sdk-test-app.netlify.app' \
--header 'api-key: pk_dev_2a79cad91c884bc7bb425a9822d09d0b' \
--data '{
    "payment_id": "pay_wp2gnnTNuK1oxMF2T6Yf",
    "wallets": [],
    "client_secret": "pay_wp2gnnTNuK1oxMF2T6Yf_secret_T10Mxvzq3hqBWfxOfIJI"
}'

-> Now disable klarna for stripe, create a payment and make a session call.

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