Learn about how not to implement it by downloading this "My MDA" app https://play.google.com/store/apps/details?id=il.org.mda.mymada https://play.google.com/sto

Learn about how not to implement it by downloading this "My MDA" app https://play.google.com/store/apps/details?id=il.org.mda.mymada https://play.google.com/store/apps/details?id=il.org.mda.mym... (careful Hebrew there, but app UI is in English)