Extend webshop

[lebe1]

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Description

IMPORTANT TO KNOW

This PR would require a change in the frontend not calling /items/ anymore but /items/backoffice/ instead!!

First you have to comment these lines as a hack in dev mode to get the verify-response without verifying the order.

Then start all your containers docker compose up -d

For this PR to review you then need to create an order with a JSON-Input such as in swagger

{
    "entries": [
        {
            "item": 1,
            "quantity": 2
        },
        {
            "item": 2,
            "quantity": 30
        }
    ],
    "vendorLicenseID": "fl-123"
}

After a successful redirection from VivaWallets demo instance you have to copy and paste transactionID and orderID into the /orders/verify GET-call.

Your sample response should look simliar to this one:

{
  "TimeStamp": "2023-10-31T14:42:36.814772Z",
  "FirstName": "firstname1",
  "PurchasedItems": [
    {
      "ID": 158,
      "Item": 1,
      "Quantity": 2,
      "Price": 300,
      "Sender": 3,
      "Receiver": 6,
      "SenderName": "UserAnon",
      "ReceiverName": "fl-123",
      "IsSale": true
    },
    {
      "ID": 159,
      "Item": 2,
      "Quantity": 30,
      "Price": 1,
      "Sender": 3,
      "Receiver": 6,
      "SenderName": "UserAnon",
      "ReceiverName": "fl-123",
      "IsSale": true
    }
  ],
  "TotalSum": 630
}

CHANGES

• Added one more handler for backoffice view to show all items in /items/backoffice
  • After consideration, I think disabling to update the two crucial items of donation and transaction costs is better than not showing them to the backoffice user. I would do that in a future PR. What do you think @nanu-c ?
• Changed /items/ handler to list only purchasable items i.e. licenses
• Improved orders call so items with licenses do not mess up the index in the for loop anymore
• Extended response of verify handler /orders/verify/

TODO

Checklist:

• [x] I have commented my code (or ChatGPT did), particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings, neither in my IDE nor in my browser
• [x] I have added tests that prove my fix is effective or that my feature works