Hi Antony, You can add a number response validation for the amount field to enforce the minimum order amount. Login to Neartail > click on the form to open it > Edit page will be displayed > In the Edit page, click on the Order Amount field to select it > click on the settings gear icon > Field settings page will be displayed > click Answer > click on the Configure link for the Validation option > select "Number", "Greater than or equal to" > enter your minimum order amount (e.g., 20) > enter a custom error message and click Save.

Thank you very much. That was highly helpful. Great going guys!