After your Printful Plus subscription ends, you won't be able to order products containing content that was created using Printful Pro or Printful Plus tools.
Product templates and synced products in your store will still be visible. However, orders with products containing designs with the Background Removal Tool layers will be imported as Failed.
To continue submitting orders with products created with the Background Removal Tool and/or templates, you'll need to either edit the order, the synced product, or the template to remove the Plus layers or resubscribe to Printful Plus.