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add_action( 'woocommerce_checkout_process', 'wc_minimum_order_amount' );
add_action( 'woocommerce_before_cart', 'wc_minimum_order_amount' );

/**
* Minimum order subtotal amount for checkout (excl shipping and taxes)
*/
function wc_minimum_order_amount() {
$minimum  = 75; // cart->get_subtotal(); // Cart subtotal excl. shipping and taxes
$chosen_methods = (array) WC()->session->get( 'chosen_shipping_methods' ); // Chosen shipping method rate Ids (array)

// Only when a shipping method has been chosen
if ( ! empty($chosen_methods) ) {
$chosen_method  = explode(':', reset($chosen_methods)); // Get the chosen shipping method Id (array)
$chosen_method_id = reset($chosen_method); // Get the chosen shipping method Id
}

// If "Local pickup" shipping method is chosen, exit (no minimun is required)
if ( isset($chosen_method_id) && $chosen_method_id === $shipping_method_id ) {
return; // exit
}

if ( $subtotal < $minimum ) {
$message = sprintf(
esc_html__('Your current order subtotal is %s. To place your order, you must have a minimum amount of %s (excl. shipping and VAT).', 'woocommerce'),
wc_price( $subtotal ),
wc_price( $minimum )
);

if( is_cart() ) {
wc_print_notice( $message, 'error' );
} else {
wc_add_notice( $message, 'error' );
}
}
}