Please do read the terms and conditions. As a reference, here are 5 points to note from the terms and conditions regarding your responsibilities as a vendor:

You are responsible for all aspects of the transactions between yourself and the customer regarding the sale of a product including delivery, returns, refunds, guarantees, warranties or other after sale care; You are responsible for ensuring that your stock is up to date and available to customers when they order it on ShopAppy.com

Please ensure that you adequately store items for click and collect both in your shop or at the single collection point – for the latter please ensure that you are satisfied with the storage requirements provided at the click and collect point and also provide storage instructions to the click and collect point

You are not permitted to store or use any data from the shopappy transaction with the customer for your own or other purposes beyond the fulfilling of the sale

Content you add including photographs, descriptions and items you sell as well as the wording and pricing you use must be within UK and all other applicable laws

Here are the full Vendor Terms and Conditions