Refine the points system: create a coin exchanger

We have a points system: each user can receive points for certain actions (no matter for which). We have 4 types of points. Each type differs in course. Example: brains - 2 coins, a light bulb - 1 coin and so on.
The task is to make a REST API method for exchanging points for coins. Api method something like this
Input: Score Type Array
Action: exchange all points from the array for coins at the rate
Output: the number of coins that the user received

You also need to add the absolute number of points that the user has earned

Beck works for Laravel

In the response, I ask you to indicate the telegram, if there is one. I also ask you to write if you have a permanent job or you work only on freelancing

At the moment, there are other tasks on the project. This project is an online English language school. We are developing a platform for training. Specifically, this task relates to the elements of gamification