Synchronous Processing:
This endpoint provides immediate voucher creation and returns the voucher object upon successful
creation. Unlike the saga-based endpoints, this provides immediate feedback and faster response times
for simple issuance scenarios.

File Upload Support:
The endpoint supports multipart/form-data requests with file attachments. Uploaded files are:

1. Stored in the configured blob storage (typically Azure Blob Storage)
2. Associated with the voucher as metadata tags
3. Accessible via the returned URL for future reference

Duplicate Prevention:
The system prevents duplicate voucher creation by checking the RequestId. If a RequestId is provided
and already exists, the request is rejected. If no RequestId is provided, a new one is generated.

Event Publishing:
Upon successful creation, the system:

1. Sends real-time notifications via SignalR
2. Publishes domain events for downstream processing
3. Updates audit trails and activity logs

Default Values:

1. Currency: EUR (configurable)
2. Expiration: 15 days from creation
3. VoucherId: 6-character unique identifier