[BestPractice] Complete the task associated to this 'TODO' comment. #214

Codacy ID: a2e34827fb9f954ea413ce21093d5fe

File: CallbackHandler.BusinessLogic/Services/CallbackDomainService.cs
Line: 46
Rule: BestPractice (Warning)
Commit: a47f46049823fa60fc0b515d1b81697a52acc35f

Message: Complete the task associated to this 'TODO' comment.

**Code Snippet:**
```csharp
        // TODO: Validate the reference data 
```