feature request: how do we handle a sale?

1. How are we handling sales when users reach success.phtml?
I am not seeing the recording of a sale

2. about 30% never reaches success.phtml so a sale is not recorded
Can we add a simple cron job that triggers on Invoice or pay event? + pushes a variable of the order id to success.phtml and this way triggers the firing of all GTM code and scripts