Retrieving the Authorization Code and Obtaining an Access Token and Refresh Token

[liquidmoon09]

After much difficulty and confusion as to how everything works, I've managed to obtain a redirect URI which when clicked on provides me with an authorization code in the new URI its self.
Here's my question: How do I retrieve the authorization code programmatically? It's in the new URI, but then I have to copy and paste it into the code manually and re-run the program to be able to use it just once.

[dargmuesli]

The website you redirect to could show the code and maybe a button to copy it or, if you want to get more professional, the website could open your app on a button click using a custom protocol inserting your code automatically.

Here is my example of a website (in Vue) which displays the code and a button to copy it: https://github.com/dargmuesli/jonas-thelemann/blob/eda0385d2b3359f6630ccacea1096552337544a6/src/pages/api/pages/oauth.vue

[dargmuesli]

Alternatively, depending on the app you're building, you could add an in-app browsers as well which shows the authorization and is under your full control, but people might not trust your app to not monitor login credentials.