[ECP-9114] Implement /payments endpoint for express use cases

[candemiralp]

Summary

This PR creates a new endpoint the express module initiate /payments endpoint from Adyen's Checkout API. This endpoint doesn't not trigger the payment authorization command pool from payment method facade but makes an individual call to initiate offer on Adyen side.

Endpoint for guest shoppers

/V1/adyen/express/init-payments/guest

Required parameters:

• maskedQuoteId
• stateData

Endpoint for logged-in shoppers

/V1/adyen/express/init-payments/mine

Required parameters:

• stateData

Tested scenarios

• Initiate /payments call and obtain pspreference and paymentData for PayPal express.

[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud