When it comes to tracking metrics for the Lyft debit card program, there are a few key areas that should be considered. One important metric is the number of active cardholders, as this will give a sense of overall program adoption and engagement. Additionally, it's important to track the total amount of money spent using the Lyft debit card, as well as the frequency with which the card is being used. This will help to determine the financial impact of the program and whether it is driving meaningful revenue for the company. Another metric to consider is customer satisfaction with the program. This can be measured using surveys or other feedback mechanisms to assess how well the program is meeting the needs of users. Additionally, it may be worthwhile to track the cost savings associated with the program, such as any discounts provided to cardholders or reduced costs associated with payment processing. Ultimately, the specific metrics that are tracked will depend on the goals and objectives of the Lyft debit card program. By carefully monitoring key performance indicators, however, it will be possible to make data-driven decisions that help to optimize the program and drive long-term success.