Look up your account. Go to the synchrony. com registration page. Or, in the mysynchrony mobile app, click register on the log in page. Enter your account number,. with this mobile app you will be able to: • log in securely using touchid/fingerprint authentication. • make payments to your account. • check your balance and credit limit. tjx rewards ® credit card: How do i manage my credit card, pay my bill online, or check my balance? The easiest way to manage your card and pay your bill is. register…