Yes!
If you are using any Shopify 2.0 Theme, you will be able to use Ongoing & PageFly Landing page together.
Ongiong subscriptions automatically works with PageFly Landing Page app, if you are using a 2.0 Shopify Theme
However, if you are using a Vintage / Legacy Theme (aka: an older Shopify theme) , your theme will have limitations & this will not be available as an option.
Updating your Shopify theme to the latest 2.0 version lets you access the new 2.0 Shopify Theme Builder.
The 2.0 Shopify Theme Builder lets you drag & drop elements on a page like LEGO blocks, with PageFly Landing Page app & Ongoing Subscriptions.
The 2.0 Venue theme allows you to insert our subscription widget into a PageFly page.
Ongoing automatically matches your theme styles, and you have way more control over styling with no code needed.
🎉Solution: We recommend updating to the 2.0 Theme version which will solve your issue. You'll be able to add the Ongoing 2.0 subscription widget into your PageFly Landing page with a 2.0 theme.