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.

OPT:
a). Take your cat to a vet if your cat appears or acts strange while you are microchipping. A vet can rule out anything relating to your cat's sensitivity.
b). 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.
c). Try to avoid doing so on your own as well. People who come in contact with this type of pet are generally not able to microchip their cats.
d). Keeping your cat indoors with the chip is also illegal, as is using an epipen or prescription medicine. Skip this part and put the microchip into an epipen.
b).