Parse JSON with Ruby On Rails 5 usin API Key

Clash Royale CLAN TAG#URR8PPPParse JSON with Ruby On Rails 5 usin API Key
Hello everyone i hope you are all well. I'm pretty new to Ruby on Rails and i find myself on a situation that i'm sure it will be easy for the majority of you but i'm struggling a bit.
I have an API key and an API URL to retrieve data in JSON.
How can i access these data from my rails application and finally display them?
I ideally need all the steps required in bullet points to get an idea.
It's a pretty open question but i'm mainly interested in the approach.
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