I am looking to start a Subscription App in my store but having trouble finding one that will allow my customers to mix and match products for their monthly allowance of Nail Wraps. Also I have over 500 designs and need all of them to be available to...

I have just started my Shopify store and sell Nail Wraps. At the moment I post using a Large Letter to my customers in the UK. I am looking to start selling to the EU but now so confused about how I go about this and what I have to do. Please can som...