Change value in member account based on purchase

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Hello,

I am trying to see if something like this would be possible.

My client would like to offer time slot booking for their studio space. A user would have to go to their website, create a membership account and purchase session credits. The credits will be sold in batches – i.e. 1, 4 and 8.

Then they would be able to use said credits to book a time slot in a dynamic calendar that would offer spaces based on availability and gear. I have already worked out (I think) a way to integrate this with calendly.

But my questions are these:

1. How do I assign (add) a number of sessions to a user profile automatically, based on the package they’ve chosen (+1,+4 or +8)?
2. How do I make sure to automatically deduct (-1) from that number every time they book a session? Especially since it will be done with calendly as part of the steps?
3. How do I prompt users to buy more session credits when their amount reaches 0?

Thanks for your help!

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