What are some best practices on architecture for a simple app to communicate with an external Web API? [on hold]

I'm creating a simple C# console application which communicates only to a Web API and dumps the content to the hard drive.

I would like to send a number to a Web API, which will take a while to process and then it will send me back a report. That report will be processed and converted to an Excel file. No database is needed.

Are there any best practices in terms of architecture for communicating with an external Web API in C#?