integrate or develop API in web application using PHP

Throughout my career, I have integrated many APIs on my client's web applications which includes:

Social media APIs - facebook, linkedin, twitter, youtube, etc

Location data APIs - yelp, foursquare, google etc

Forex and currency APIs - gdax, bittrex, poloniex etc

Ecommerce APIs - Shopify, woocommerce, chinavasion, etc

Technologies I use:

PHP

MySQL database

HTML5

CSS3

JavaScript

Jquery

Bootstrap

SASS

BEM