paymentkey
nounUK /ˈpeɪmənt kiː/
US /ˈpeɪmənt kiː/
A special code or card you use to pay for something.
She typed the paymentkey into the website to buy her new shoes.
OTHER MEANINGS
2. A digital token that lets a computer confirm a payment was made.
The app stored the paymentkey so the next purchase was quick.
3. A secret string used to unlock a saved card in an online account.
Keep your paymentkey private so nobody else can spend your money.
4. A key on a payment terminal that starts the charge.
The cashier pressed the paymentkey to finish the sale.