PHP is a general-purpose server-side scripting language originally designed for web development to produce dynamic web pages. wikipedia.org

Zapier connects the web apps you use to move data and automate tedious tasks. wikipedia.org

Shopify is an e-commerce platform that allows individuals and businesses to create online stores. The Shopify platform includes a content management system that allows users to manage inventory, edit HTML and CSS code, create coupon and discount codes, and accept online payments online with... wikipedia.org

PayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. Online money transfers serve as electronic alternatives to paying with traditional paper methods, such as checks and money orders.

Zoho CRM offers customer relationship management functionality, procurement, inventory, and some accounting functions from the realm of ERP. wikipedia.org

Customer relationship management (CRM) is a widely implemented strategy for managing a company's interactions with customers, clients and sales prospects. wikipedia.org

Stripe is a set of unified APIs and tools that enables businesses to accept and manage online payments.

Zoho Creator is an online database/custom application development tool which allows users to create fairly sophisticated process logic by dragging & dropping script elements on screen, without knowing code. wikipedia.org