I would like to control the coupon codes for the Summerp Camp sign up form

I am offering a discount but it will be for a specific time period,  one day. Is there way to disable the coupon until I need to activate it?

Also, I have seven products. I only want each product to have 20 users then the coupon is disabled. Is that possible?

thank you

Once you add the coupon, that will be live on the form. There is no way you can control it by date. 

Unfortunately, you cannot choose both Expiration Date and Number of Uses through the Coupon Limit dropdown. The Number of Uses cannot be attributed to a specific item either, so in this use case, you have to add one coupon for each item. 

When adding a coupon code for each item, choose Number of Uses so you can input 20 as the capping.