// function createTimeCode($session, [$offset], [$validity_minutes])
// Return a time-based code based on the key and ID of the given session.
// An offset can be given to create a specific code for verification, otherwise and offset will be generated.
// function createTimeCode($session, [$offset], [$validity_minutes])
// Return a time-based code based on the key and ID of the given session.
// An offset can be given to create a specific code for verification, otherwise and offset will be generated.