pls help me with what you said about endpoint.  How do i do that?

I have used QB POS desktop since 07. I also use enterprise and their cc processing but obviously am screwed in October.  I have been trying to locate an alternative:

Do you or anyone have a suggestion

1- go to QB online

2- lightspeed

3- shopify; which says will migrate all your info over but are you saying I will still have to pay to access my QB POS 19 data?

thanks