Hi Sue, if you are getting an invalid amount configuration error, then it indicates that the correct form field it not mapped for the Amount option in the Summary settings page. Please make the changes listed below. Delete redundant field You have added two fields "Total Amount Due" and "Amount" with the TOTAL() formula to calculate the amount in the form. Please delete the redundant "Amount" field. Summary settings Summary settings page allows you to select the relevant fields for the form for the Amount, Discount, Tax, Delivery Fee, Tip, Net amount option. The mapping in the Summary settings allows Neartail to identify the field with the amount to be charged and pass this amount to the selected the payment option such as Stripe or Paypal. If you have mapped a field for the Net amount option, the answer for that field will be passed to Stripe. Otherwise, the answer for the field mapped for the Amount option will be passed to Stripe. You will get an "Invalid amount configuration" error if the Amount, Net amount options are not mapped correctly. Since you are calculating only the amount in the form, you just have to map the correct field for the Amount option. Login to Neartail > click on the form to open it > Edit page will be displayed > In the Neartail edit page, click on the gear icon next to the form title > Form settings page will be displayed > Click on the configure fields icon next to the Save button > Summary settings page will be displayed > Select the "Total Amount Due" field for the Amount option, select None for the Net amount option > click Save. Enable payments Login to Neartail. Click on the form to open it. Edit page will be displayed. In the Neartail Edit page, click on the gear icon next to the Submit button. Button settings will be displayed. Click Enable payments. The payment options supported in your country will be displayed. You can configure the Paypal automated payment, enable the Check payment option and click Save. Once you complete the setup, you can use the Neartail share link to submit a response and test the payment process to ensure everything is working correctly. Automated payments When this option is enabled, users will be able to submit the order only if the payment is successful. Please note Paypal charges a transaction fee. Manual payments When a user places an order, the payment status will be either marked as "Pending" (not paid) by default. If the user clicks on the Mark as paid button, the status will be updated as "Paid, not verified". Once you verify the payment, you can mark the order as "Paid".