You can easily import existing Product catalogs to your ethPay store.
First, have a look at our catalog template, it includes two examples of a product file as well as a file called 'ethpay.yml'.
In this file you specify your store address. You can access your store address by tapping 'Share address' in the menu of your store.
Paste your store address into the ethpay.yml file at 'contract'.
Replace the exemplary product files with your own. Make sure they all have the JSON-LD format.
Load the folder with your product files and the ethpay.yml file to your smartphone and tap 'Publish catalog' in your store menu (to upload your product catalog to IPFS you will be asked to download the ethPay merchant app).