The System Tab contains an Sub tab name as Payment Methods

From Here The Payment Methods can be Updated as per requirements
Paypal Payments : From Here we can update the Paypal Payments
Payment Mode : From Here we can update the Payment Mode
Paypal Business Email :

From Here we can update the Paypal Business Email
Currency code : From Here we can update the Currency code
Notification URL : From Here we can update the Notification URL

PayUMoney Payments
PayUMoney Payments : From Here we can update the PayUMoney Payments
Payment Mode : From Here we can update the Payment Mode
Merchant key : From Here we can update the Merchant key
Merchant ID : From Here we can update the Merchant ID
Salt : From Here we can update the Salt

Razorpay Payments
Razorpay Payments : From Here we can update the Razorpay Payments
Razorpay key ID : From Here we can update the Razorpay key ID
Secret Key : From Here we can update the Secret Key

Paystack Payments
Paystack Payments : From Here we can update the Razorpay Payments
Paystack key ID : From Here we can update the Razorpay key ID
Secret Key : From Here we can update the Secret Key

Flutterwave Payments
Flutterwave Payments : From Here we can update the Flutterwave Payments
Flutterwave key ID : From Here we can update the Flutterwave key ID
Secret Key : From Here we can update the Secret Key
Flutterwave Encryption key : From Here we can update the Flutterwave Encryption key

Cash On Delivery
COD : From Here we can update the COD
Click Update Payment Settings to the Update Payment Settings or Reset to Reset the form.