class

• post > wc-class-plugin-starter-for-woocommerce link > https://github.com/greatwitenorth/woocommerce-quantity-increment-buttons/blob/master/woocommerce-quantity-increment-buttons.php
• post > plugin-class-starter link > https://www.sitepoint.com/real-world-example-wordpress-plugin-development/
• post > plugin-class-starter link > https://www.sitepoint.com/real-world-example-wordpress-plugin-development/