Consume Rest API in Asp.net webforms project

Question

Hello,

 

I have a Asp.net webforms project and I have to consume an external REST API to send our data.

 

I have two layers in my project, Presentation layer and service layer (like DAL - it has all my WCF services).

 

Currently, there is a existing screen with save method which saves data to the application database. If the transaction is successful, then I have to post the same data to External API. 

 

So the question are

 

1. In which layer(Presentation or Service) I need to implement the WEB API call?

2. Should I create any  Web API controller to consume the Rest API.

 

 

Thanks.