I am testing Oracle GloriaFood as booking and payment service for my restaurant that I’m going to open.
GloriaFood is a 100% digital service that you can integrate/module install in your WP website. It works that when a customer buys something the customer have to wait in the ordering page until the restaurant will receive a notification in a separate app, and accepts the order by putting the time to collect, this information is then sent to the customer through the website, but when customer closes the website then he need to count when the actual order is ready to collect.

I would like to integrate that when the restaurant assigns that order as ready to pickup then it sends automatically an SMS to the customer.

GloriaFood have the Open APIs on GitHub, https://github.com/GlobalFood/integration_docs
I’m an old programmer but never did anything with API so not sure how to do this, someone that can guide me?
My website will be done in WordPress with the GloriaFood integration.

I tried the sms service SMSAPI and have a PHP code ready, but I still get to know where to put it, how to collect the data and populate variables and how to trigger it.