I have an inventory/Point of Sales App for a restaurant and bar which was developed using PHP and Mysql. I need an API for this App which can share inventory and sales report with another APP.
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Google “web api php tutorial”. The first hit I got looks good.
What you need to know to develop your API is what are the requirements of the calling app. That is, it wants to make a specific API request and receive data in a specific format. You need to program your API to a) provide the required request(s); b) return your data in the required format.