Add settings to allow further customization

[malessani]

Description

This Feature will allow to set or override settings received from order and organization endpoint to allow an improved level of customization. Configuration can also be linked to a market.

• [x] Add custom thankyou page URL
• [ ] Set email and phone support, logo, favicon, primary color, GTM id
• [ ] Privacy and terms url
• [ ] Override order language
• [x] Set list of billing and shipping countries / states
• [x] Preselect default country
• [ ] Enable/disable state/province selector for countries without states
• [ ] State field optional
• [x] Guest checkout for order with subscription (alert for customer)
• [x] Set automatically save customer payment source for order with subscription
• [ ] Override label translations (passing keys or path to files) (only checkout dev)
• [ ] Enable/Disable payment methods based on custom rules (needs components support)
• [ ] Sort payment methods on the payment step
• [ ] Enable/Disable login
• [ ] Switch columns between summary and form
• [ ] Enable/Disable unit price on the order summary
• [ ] Enhanced configuration for GTM (client and server side)
• [ ] MFE URLs for forked applications
• [ ] Add external validation config to avoid placing orders
• [ ] Add copy and custom text in the thank you page Redirect to thank you page
• [ ] Add metadata to order

Each item needs to be assessed in terms of benefits/feasibility.

[clgiovannelli]

Something like this @malessani @mscardellato ?

{
  "checkout": {
    "support": {
      "email": true,
      "phone": true
    },
    "branding": {
      "logo": "path/to/logo.png",
      "favicon": "path/to/favicon.ico",
      "primaryColor": "#hexcolor"
    },
    "tracking": {
      "gtmId": "GTM-XXXXXX"
    },
    "legal": {
      "privacyUrl": "https://example.com/privacy",
      "termsUrl": "https://example.com/terms"
    },
    "orderSettings": {
      "overrideLanguage": "language_code",
      "billingCountries": [
        "US",
        "GB",
        "FR"
      ],
      "shippingCountries": [
        "US",
        "GB",
        "FR"
      ],
      "defaultCountry": "US",
      "guestCheckoutForSubscription": {
        "enabled": true,
        "alertCustomer": true
      },
      "savePaymentSourceForSubscription": true
    },
    "translation": {
      "overrideLabelTranslations": {
        "filesPath": "path/to/translation/files"
      }
    },
    "payment": {
      "enableCustomPaymentRules": true,
      "enabledMethods": [
        "credit_card",
        "paypal"
      ],
      "disabledMethods": [
        "bitcoin"
      ]
    },
    "userInterface": {
      "enableLogin": true,
      "layout": {
        "switchColumns": true
      },
      "thankYouPage": {
        "customText": "Your custom message here.",
        "redirectUrl": "https://example.com/thank-you"
      }
    }
  }
}