The consumption methods provided by Postal Savings Bank when using credit cards for consumption include: credit card consumption, scan QR code payment and small password-free payment.

1. Consumption by credit card: Users holding Postal Savings Bank credit cards can directly swipe their cards at merchants to complete payment.

2. Scan the QR code to pay: Postal Savings Bank credit cards also support payment using QR codes.

3. Small-amount password-free payments: Postal Savings Bank credit cards also support small-amount password-free payments in some specific scenarios.