This folder includes the following samples:

csharp_payment: a simple .NET server implementation for taking payments with an accompanying UI.
java_catalog: a Java command line app that manages catalog items using the Catalog API.
java_payment: a simple Java server implementation for taking payments with an accompanying UI.
node_catalog_subscription: a Node.js server paired with a React app that demonstrates subscribing to catalog items.
node_gift-cards: a Node.js webapp for managing gift cards using the Gift Cards and Gift Card Activities API.
node_invoices: a Node.js server implementation for creating invoices.
node_orders-payments: a Node.js server implementation for taking online orders with itemization and delivery options, then making a payment.
node_payment: a Node.js server implementation for taking payments with an accompanying UI.
node_subscriptions: a Node.js server implementation for creating and managing subscriptions for a merchant.
php_payment: a simple PHP server implementation for taking payments with an accompanying UI.
python_payment: a simple Python server implementation for taking payments with an accompanying UI.
rails_payment: a simple Ruby on Rails server implementation for taking payments with an accompanying UI.
rails_snippet: a Ruby on Rails server implementation of using OAuth to add an HTML snippet to a Square Online store.
v2_deprecated: contains examples that have been deprecated

For more information, visit the Square SDK page: https://developer.squareup.com/docs/sdks