title: How to use external API in Ruby in Rails
body: <p>I need to use an external API in my app in order to have companies informations. Beginning and having never used API in ruby, I don't know where to start. Maybe there is a gem for it but I have found 2 API that returns me JSON : <a href="https://datainfogreffe.fr/api/v1/documentation" rel="noreferrer">https://datainfogreffe.fr/api/v1/documentation</a> and <a href="https://firmapi.com/" rel="noreferrer">https://firmapi.com/</a> (they're in french sorry about that).
  Does someone have a good tutorial or hints to help me begin ?</p>
  
  <p>The final need is to retrieve companies datas just by giving the company ID.</p>