Go to POS configurations >> Enable 'Tabby Integration'.

Select 'Tabby' as a payment method.

Go to the 'Payment Methods' from the configurations menu.

Tree view of the Payment Methods.

In the payment methods form view, select the option 'Is Tabby Payment Method?' and enter the 'Tabby Secret Key'. Complete the form by adding other required details.

Place an order and click on the the 'Payment' button.

Click on the 'Tabby' payment method. After that this wizard will appears.
Enter a mobile number and click on the 'Send' button.

Click on the 'Pay Order' button.

Enter your valid details, such as email and phone number.
Then, proceed with the payment process.

'Payment Successful!' notification popup looks like below.

Once the payment is successful, Odoo will automatically validate it and generate a receipt.

In the order form, you can see that the order status is 'Paid'.

You can view the payment details under the 'Payment' tab.

You can view the tabby response under the 'Tabby' tab.

Go to the orders.

Click on the 'Tabby Orders' from the 'All Active Orders' menu.

Tree view of the tabby orders.

On the POS screen, if you attempt to add a percentage after the order has been paid, a warning popup will appear.

On the POS screen, if you try to change the price after the order has been paid, a warning popup will appear.

Click on the 'Action' button, then select 'Cancel Order'.

If you attempt to cancel the order after it has been paid, a warning popup will appear.