How was the dynamic forms scheme implemented in the promotion builder - on the frontend or received from the backend?

The dynamic forms scheme in the promotion builder is implemented on the backend and comes to the frontend as a description of the form structure. This allows flexible changes to fields, their types, validation, and logic without the need to modify the frontend code.

For example, the backend returns a JSON describing the fields:

{
  "fields": [
    {"name": "discount", "type": "number", "label": "Discount", "required": true},
    {"name": "startDate", "type": "date", "label": "Start Date", "required": true}
  ]
}

The frontend renders the form based on this, handles input and validation. This approach simplifies support and extension of the constructor's functionality.