API > import & update DB

I want to use this api : https://restcountries.eu
I don’t have problems to connect and display data on page. All ok with documentation and community. Works like a charm.
But i would like to connect to this api > import in a database and check / update on a regular basis. This means i would use the database to display the data on the page.
I found some topics here but not exactly the same case and can’t make it working.
Now i have this set up but i’m pretty i’m missing lot of steps to make this working.
Any idea?

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