### [How to Restrict Coupons by Amount](https://wpforms.com/developers/how-to-restrict-coupons-by-amount/)

**Published:** October 20, 2023
**Author:** Editorial Team

**Excerpt:** In this tutorial, we'll use a PHP action to restrict coupons from processing if under a set amount. 

**Content:**

## Introduction

Are you interested in how to restrict coupons based on a specified amount? This tutorial will guide you through the process of utilizing a PHP action to prevent coupons from being processed when their value is below a set threshold.

By default, you have the option to create coupons in either a percentage or flat rate format for any amount. However, what if you mistakenly input **.75** instead of **75%**? This small code snippet can help you avoid such errors in form submissions, and we’ll walk you through the process in this tutorial.

To learn more about using coupons, [please review this helpful guide](https://wpforms.com/docs/coupons-addon/ "Coupons Addon").

## Creating the coupon

To start, let’s create a coupon. In this tutorial, we’ll create a coupon with a flat rate fee of **.75**, even though our intention is to set it at **75%**. This is just for demonstration purposes and to highlight how the snippet we’ll be adding can help with validation.

To create a new coupon, navigate to **WPForms » Payments » Coupons** and click **Add New Coupon**. Inside the **Name** field, give your coupon a name that makes sense to you for organizational purposes.

Next, in the **Code** field you can either manually enter a coupon code or click the **Generate Code** button to allow WPForms to create this code for you. Inside the **Amount** field, enter **.75** and from the dropdown, be sure to select the currency symbol.

By selecting the currency symbol, you’re utilizing the flat rate discount rather than a percentage.

For this tutorial, we’re not going to set a date or time so we’ll scroll down and select the forms we want to use this coupon for and then click **Save Coupon** to save your changes.

![in order to restrict coupons, we must begin by creating a new coupon](https://wpforms.com/wp-content/uploads/2023/10/wpforms-coupon-field-validation-create-coupon.jpg)

## Creating the form

Now that the coupon is set up, it’s time to create the form. For any assistance in how to create forms, [please take a look at this step-by-step guide](https://wpforms.com/docs/creating-first-form/ "Creating Your First Form").

![create your form and add your fields](https://wpforms.com/wp-content/uploads/2023/10/wpforms-coupon-field-validation-create-form.jpg)

Once we’ve added the **Coupon** field, you’ll notice that the coupon is already assigned.

![notice that when you add the coupon field, the allowed coupons are already assigned](https://wpforms.com/wp-content/uploads/2023/10/wpforms-allowed-coupons.jpg)

## Adding the snippet

Now it’s time to add the snippet. If you need any help in how and where to add snippets, [please review this tutorial](https://wpforms.com/developers/how-to-add-custom-php-or-javascript-for-wpforms/ "How to Add Custom PHP or JavaScript for WPForms").

```

/*
 * Do not allow to submit coupons lower than 1.00.
 *
 * @link https://wpforms.com/developers/how-to-restrict-coupons-by-amount/
*/
 
function wpf_discard_low_coupons( $field_id, $field_submit, $form_data ) {
 
    $coupon = wpforms_coupons()->get( 'repository' )->get_coupon_by_code( $field_submit );
 
    if ( $coupon === null ) {
        return;
    }
 
    $currency = wpforms_get_currency();
 
    if ( $coupon->get_discount_type() === 'flat' && (float) $coupon->get_discount_amount() get( 'process' )->errors[ $form_data[ 'id' ] ][ $field_id ] = sprintf( /* translators: %s - Currency code name. */
            esc_html__( 'Coupon amount is less that 1.00 %s. Please, use another one.', 'your-translation-domain' ),
            $currency
        );
    }
}
add_action( "wpforms_process_validate_payment-coupon", 'wpf_discard_low_coupons', 10, 3 );
```

And that’s all you need, whenever a visitor uses that coupon they will not be able to submit the form.

![by using this snippet to restrict coupons, you will see an error on the form when the coupon is used](https://wpforms.com/wp-content/uploads/2023/10/wpforms-restrict-coupon-error.jpg)

## Related

Action Reference: [wpforms\_process\_validate\_payment-coupon](https://wpforms.com/developers/wpforms_process_validate_payment-coupon/ "Using the wpforms_process_validate_payment-coupon action")

**Categories:** Tutorials

**Tags:** Coupons, PHP

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