This is SUPER important...
Pause = Temporarily halt the campaign. You can resume at any time with your remaining lead balance. No extra charges. You can repurpose the campaign for different keywords using the remaining balance
Stop = Permanently end the campaign. If you want to restart it later, you'll need to pay again. WARNING: You can NOT repurpose the campaign if you STOP a campaign so if there is any remaining balance in that campaign can’t be used.
Big WARNING here: If you stop a campaign and try to restart it, the system will charge you again. It's designed this way.
When to use Pause:
Taking a break
Adjusting keywords
Reviewing results before continuing
When to use Stop:
You're completely done with that campaign
You want to start fresh with a new budget
Pro tip: When in doubt, pause. You can always stop later, but you can't undo a stop without paying again.