Wow after all these years there is still no solution for this? Square allows the merchant to process credit cards of a certain amount when there is no internet and sync later. I have lost hundreds in sales over the years because of this very same iss...

I am having some serious shipping issues.I have a small and light product. Measuring 4" x 4" x 0.05".  0.05oz weight . I ship in a 7" X 8" bubble mailer. When I calculate the cost in Shopify the price is $1 first class mail but my mails are being ret...