# ClickFunnels Apps

- [Smart Optin](/connecting-to-clickfunnels/clickfunnels-apps/smart-optin.md): Simplify user engagement
- [Facebook Client ID](/connecting-to-clickfunnels/clickfunnels-apps/smart-optin/facebook-client-id.md): What is the Facebook Client ID and how to obtain it:
- [Google Client ID](/connecting-to-clickfunnels/clickfunnels-apps/smart-optin/google-client-id.md): What is the Google Client ID and how to obtain it:
- [Smart Currency Converter](/connecting-to-clickfunnels/clickfunnels-apps/smart-currency-converter.md): Learn what you can use Smart Currency Converter for and how to install it:
- [Programmable](/connecting-to-clickfunnels/clickfunnels-apps/using-programmable.md): Learn how to install Programmable with your funnel and adapt it to your business' needs!
- [Fancify](/connecting-to-clickfunnels/clickfunnels-apps/fancify.md): Find out how to turn on Fancify inside your funnel!
- [Product Variant Set Up](/connecting-to-clickfunnels/clickfunnels-apps/fancify/product-variants.md): Learn how to configure multiple variants for your products in Funnelish!
- [Paypal Plugin](/connecting-to-clickfunnels/clickfunnels-apps/paypal-plugin.md): Start processing payments with Funnelish and Paypal!
- [Testing Purchases](/connecting-to-clickfunnels/clickfunnels-apps/paypal-plugin/testing-purchases.md): You want to do a test purchase? Here is how you can do it:
- [Smart Address Plugin](/connecting-to-clickfunnels/clickfunnels-apps/smart-address-plugin.md): Find out how to install it and what does it do!