Cart Validation Script

<script type="text/javascript">
var alertMessage = "You need to order at least $150 in order to checkout";

function priceCheck() {
  if (fc_json.total_price >= 150) {
    FC.checkout.config.isValid = true;
  } else {
    FC.checkout.config.isValid = false;
    alert(alertMessage);
  }
}

// Run our custom validation before the checkout validates
FC.checkout.overload("validateAndSubmit", "priceCheck", null);

jQuery(document).ready(function() {
    if (fc_json.total_price < 150) {
        alert(alertMessage);
    }
});
</script>