What steps to take to connect local program to the Retail API?

Hi all, Im an intern and was asked to make a connection to the Retail API. Now I have 'read the API documentation and am still stuck on where to begin. I need to know the steps to take to get to the point where I have an access token with refresh token in the same response. Can I get to this point only by backend code?
Why do I need to do this? One of our clients requested that we connect to them through Lightspeed Retail as wel (We are already connected to Lightspeed E-commerce). So in order to give the client the most out of our platform we wish to connect to Lightspeed Retail as well.
Any advice/tips on what to do would be much aprreciated!
Thanks in advance!
Best Answers
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Adrian Samuel Moderator, Lightspeed Staff Posts: 654 moderator
Hey @BasvHees,
Check this out: https://community.lightspeedhq.com/en/discussion/3979/lightspeed-retail-api-tutorial/p1?new=1
Adrian Samuel
Software Developer
Lightspeed HQ
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BasvHees Member Posts: 2
Thank you so much! I have been searching for hours to get this. It's straight to the point and really usefull information!