App for Virtual Product Fulfilment Options

[plam]

Hi, I work for a charity and we want to explore ways to fulfill Christmas Card donations (similar to 'donate a goat' type campaigns you see)

I've found a couple of examples online that use shopify: 

https://www.usefulgifts.org/products/a-sustainable-future

https://caregifts.org.au/collections/top-gifts/products/a-lamb

What apps are available to use where I can get these fulfillment options?

- Physical card sent

- Download and print card (link to pdf)

- Send ecard

- No card is required

Thank you!