During the first two shots, people had to register through CoWin to book slots for vaccination and needed identity proof. Nonetheless, since the registration was previously done at that time, no additional identity proof is now required to get a booster dose.
You can carry your CDC vaccine card so that your booster dose can get included. However, this is not mandatory.
As you have read till now, we hope to provide you with every necessary detail regarding eligibility for a booster dose. So, to conclude, this additional course of vaccination is necessary to create a long-lasting effect on the erstwhile taken vaccination. After you get a booster shot, it is common to experience certain side effects. However, there is nothing to worry about because these are temporary and mild.