Question posted in 
I am an SEO professional and pretty new to APIs but I know some SQL, Python and JavaScript. I write code in Google App Scripts a lot so now that I’m working in Upwork a lot I want to see if I can create a sales pipeline in Gsheets with Upwork API. For a web project they require a callback URL and I’m stuck there, no idea what that would mean in my scenario.
It appears I need to host on my server, is that correct? Or is web project not what I want?
What is a callback URL in relation to an API?
Please help
https://www.upwork.com/developer
https://www.upwork.com/developer/documentation/graphql/api/docs/index.html
Nothing yet, I’m simply at the stage of requesting an API
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2
Answers
When you make a call to an API, the remote site process the call and then answer it.
A callback URL is a page in your server that the remote site will invoke with some parameter for you.
For example, in PHP, you can have something as https:/myserver.com/callback.php
That is a "callback URL" sample. Inside callback.php, you can read the parameters that the remote site sent to you (perhaps using $_REQUEST).
Check this out: What is a callback URL in relation to an API?
Callback URL, also known as
redirect_uriin terms of OAuth2 protocol (see RFC 6749, Section 3.1.2 for more details), is the URL where the authorization server will redirect to, together with the received authentication token. And the received side must handle that properly.