Can I upgrade for 1 month, then downgrade?

I have some work I need a vendor to do on my app, and I would like to use version control to allow them to make changes that get pulled in after I verify them.

Can I upgrade to Growth, do the work over a month or so, then downgrade back to starter until my scale warrants a move to the growth plan permanently?

I think so, but if you want certainty ask bubble bot. It is located as soon as you are logged in on bubble.io at the bottom right.

Bubble allows you to upgrade/downgrade plans any time - no worries

Yes you can