No saved Bank Card(s):
Step 1: Click on your Profile
Step 2: Go to My Bank Card(s), and enter your credit/debit Card information.
Step 3: Turn on the toggle for Quick Payment to enable this feature.
Saved Bank Card(s):
Step 1: Click on your Profile
Step 2: Go to My Bank Card(s)
Step 3: Click on the bank card you want to enable Quick Payment for.
There is an indication to show that you have turned on this function
Below are the articles that may be useful for you :
Can I delete my saved bank card or the bank card I’ve selected for Quick Payment?
What if I want to completely disable the Quick Payment function?
Is Quick Payment automatically turned on for my saved bank card?