Can I create a link to share with my email list that lets the pay directly to my square account.

[Dr_B]

 I would like for people to click on a link and pay me for a T-shirt directly.  

[ryanwanner]

You could always use the Cash App for this if it's a one-off sale.

What you could also do is set up an online store. Go to the Online store link in your Dashboard and follow the steps. Once you're set up, you'll have a website address that you can share to your email list. You can see more info on Square's Online Store primer page.