feat: add age validation in signup and update payment verification logic

components/auth/signup-form.tsx

@@ -230,6 +230,11 @@ export default function SignUpForm() {
 							{actionState?.errors?.fieldErrors?.dob}
 						</span>
 					)}
+					{actionState?.db_error === "dob" && (
+						<span className="text-sm inline-block text-red-500">
+							{actionState?.message}
+						</span>
+					)}
 				</div>
 				<div>
 					<label htmlFor="accNo" className="text-sm">