Hi everyone, and welcome to the forums!
To mbroarct: To collect for several different charities would present some degree of complexity, the way you describe it. Are all the funds managed by your own 501(c)3 organization, or are you collecting on behalf of other charities? While review of every organization's unique circumstances does occur, it's possible that this may not be something that can be done through PayPal the way the system is currently designed.
To all: For recurring donations, a regular subscription button would be used, or you can use Enhanced Recurring Payments
I hope this helps!
Olivia
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