Thanks for your interest in using Kiva data! There is currently no procedure for issuing new tokens as the authentication service procedures are in the middle of being migrated to a third party vendor to increase user identity security. Long-time developers are likely using tokens when the app application process was open as the REST API hasn't been fully shut down until Kiva implements a new token system for developers' apps.
Borrowers' real-time repayments are displayed only to the people that supported their project. Those stats and repayments are available to a user's own loan portfolio. If you didn't support a loan, you generally don't have access to those other borrowers' loan repayments. Your own portfolio of repayments on the website are not available to other lenders.
Hope this helps!