Build safe paying portal & student roster for kids classes and incorporate on Squarespace

We teach after-school Art programs for kids. I need an expert to add a secure payment portal and be able to create a roster as well for our in person and virtual workshops.

My website is www. jimmypotters.com

Please ONLY reply if you are very familiar with Squarespace and not going to sell me software that cost yearly.

Transparently, I need a web designer to incorporate and add my needs I mentioned above.

Need this done within the next two weeks.