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WooCommerce

Set a WooCommerce minimum order value

Intermediate functions.php

Useful for: Wholesale, delivery and low-margin stores

Prevents checkout when the cart subtotal is below £25.

Change $minimum = 25; to the required amount.

functions.php 
/**
 * Require a minimum WooCommerce order subtotal.
 */
function hmr_woocommerce_minimum_order_value(): void {
    if ( ! function_exists( 'WC' ) || ! WC()->cart ) {
        return;
    }

    $minimum  = 25;
    $subtotal = (float) WC()->cart->get_subtotal();

    if ( $subtotal >= $minimum ) {
        return;
    }

    $message = sprintf(
        'A minimum order of %1$s is required. Your current subtotal is %2$s.',
        wc_price( $minimum ),
        wc_price( $subtotal )
    );

    if ( ! wc_has_notice( $message, 'error' ) ) {
        wc_add_notice( $message, 'error' );
    }
}
add_action(
    'woocommerce_check_cart_items',
    'hmr_woocommerce_minimum_order_value'
);