In this image, we can see a template of Multiple Immigration Form (FMM). The data to be completed correspond to identifying information of the applicant. As you can see, each immigration card includes an individual number, with which it is possible to recover it in case of loss or theft. You have all the information in: «The FMM to travel to Mexico: what it is, where to get it and how to pay for it«.
You have all the information in: "The FMM to travel to Mexico: what it is, where to get it and how to pay for it".