I am building a registration form for a summer camp.

I am building a registration form for a summer camp. Ideally I would like to collect a non-refundable deposit payment at the time of registration (filling out this form) and the remainder at a later date. Is there a payment app that I can integrate that will allow me to do this? Currently I am using PayPal, but I don't know how to collect a partial payment now, save the payment info, and process the remaining payment later. Do you have a suggestion?

Unfortunately, it is not possible to collect partial payments. 

However, you can use the Sell subscription option, set custom First Payment and limit the number of payments.

How to Setup a Recurring Payment Option

If the registration for your camp is $100 and you want to collect $10 right away, you can set the Price to 90, limit the number of payments to 1 and set the First Payment to 10. 

Here is a demo form - https://form.jotform.com/200511953625046

Feel free to clone it. 

Please note that the $90 will collect automatically.