Just log in to Paypal with username and password given by user. You have to successfully login. No gui needed. Just login, no complicated logic needed.
You have to use paypal-core 1.7.0 jar
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I could make a java program in selenium that would login to paypal with a given username and password typed into the console by the user. I could also make the program read users and passwords from a text file.
Already have the similar code so I will just need to adjust it to work with paypal. project is using webdriver as a browser but without a gui so it should be a perfect match for you