Payments for the packages in the store will be handled within the store.
This is a convenience for when you need to send non-package payments or otherwise..
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Square payments provide an easy and secure method to send a custom amount with your card.
Cash App is great if you already have an account and available funds.
PayPal.me is not exactly PayPal; you can send funds like on Square if you prefer that platform. My regular business PayPal email is email@example.com for all payments.
Venmo is another great option but changed their policies so that you need to use your app and manually enter @RomanVail to send payments.