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Replace WooCommerce "Place Order" Button Text With Cart Total And Subscription Period

I'm using the following code to target specifically, subscription-based products.

// Display total amount on place order button
add_filter('woocommerce_order_button_text', 'subscriptions_custom_checkout_submit_button_text' );
function subscriptions_custom_checkout_submit_button_text( $order_button_text ) {
if ( WC_Subscriptions_Cart::cart_contains_subscription() ) {
    $cart_total = WC()->cart->total;    
return __('Pay $' . $cart_total, 'woocommerce');
    
} else {
    // You can change it here for other products types in cart
    # $order_button_text =  __( 'Something here', 'woocommerce-subscriptions'  );
}
return $order_button_text;
}

Now, I want to display the subscription period after the product price, so for example, if someone is purchasing a monthly subscription product, the button should read (Pay $20/Month).

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Answer

Use the following to get a custom "Place order" button on checkout page, when there are only subscription products is in cart, displaying the cart total with the subscription period on the submit button:

add_filter('woocommerce_order_button_text', 'subscriptions_custom_checkout_submit_button_text' );
function subscriptions_custom_checkout_submit_button_text( $button_text ) {
    if ( WC_Subscriptions_Cart::cart_contains_subscription() ) {
        $cart  = WC()->cart;
        $total = $cart->total;
        $other = false;

        // Loop through cart items
        foreach ( $cart->get_cart() as $item )  {
            $product = $item['data'];
            if( in_array( $product->get_type(), ['subscription', 'subscription_variation'] ) ) {
                $period = get_post_meta( $product->get_id(), '_subscription_period', true );
            } else {
                $other = true; // There are other items in cart
            }
        }
        // When there are only Subscriptions in cart
        if ( isset($period) && ! $other ) {
            return sprintf( __('Pay %s/%s' , 'woocommerce'), strip_tags( wc_price($total) ), ucfirst($period) );
        }
    }
    return $button_text;
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

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source: stackoverflow.com
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