The number of credentials you can create depends on the purchased license package (starting with 50 and going up to 5000 credentials for large organizations). For more information, check the Mobile Access datasheet. You can reuse the credentials as often as you like. One mobile credential is similar to one physical card. Once given to a person, it is removed from the stack of available credentials. As soon as the credential is retrieved/deleted, the stack of credentials is increased by one again.