The Central Pacific University Chipmunks have been using a simple sequence code to keep track of season

Question:

The Central Pacific University Chipmunks have been using a simple sequence code to keep track of season ticket holders and fans who are not season ticket holders for all of its sports programs. There have been some upsetting mix-ups.
In a paragraph, suggest a different coding scheme that will help uniquely identify each ticket holder and explain how it will prevent mix-ups.