Hi Mayte,
I am trying to learn how to do this also … and I did not find good resource in R. So, I found some pieces in python that I am putting together.
You are welcome to explore along with me, if you are interested.
I put a starter kit on githib at this location : https://github.com/bici-sancta/full_archive_tweet_search/blob/master/get_tweets.ipynb
I am using FullArchive to pull historic tweets, and include some basic print commands to show the structure / info contained in the returned dictionary.
Feel free to use, comment, improve.
Best regards,