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So, how does one set this up in the automated way?

Paypal has this as a feature. It's buried but you should be able to find it. It's called Auto Sweep.

Apparently you have to contact them if you don't see the link after clicking More> by your balance. (3/12)

Or, as with any website without Api, you can use tools like Selenium or Kantu that automate a system via its web interface.