What happens next?

How to microchip your cat
Avoid microchipping your cat on your own.
Never inject your cat with a microchip on your own. This is illegal in many states and can cause you to have legal measures taken against you.
There are sellers who will sell you a microchip without going through a veterinary office, but you should never implant these devices yourself. Take these to your vet to have them checked out and implanted in the right way.