need proceed justify sell web services

i'm controlling sell web services find, create, update, mislay appointments calendars some-more people. concentration used manager perspective employees' vacation time, good distribute appointments formed availability.

in method work, an real user's certification contingency sent web service. far, twin methods i have found grant 1) flitting username evidence any user 2) impersonating user defaultcredentials. defaultcredentials choice doesn't work us since grant impersonating users.

does anyone know another way?