php - How can I add a custom fee in woocommerce that is calculated after tax -


i've added custom fee checkout page following code:

add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' ); function woocommerce_custom_surcharge() {     global $woocommerce;      if ( is_admin() && ! defined( 'doing_ajax' ) )             return;      $percentage = 0.03;     $surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total + $woocommerce->cart->tax_total ) * $percentage;     $woocommerce->cart->add_fee( 'my fee', $surcharge, false, '' );  }

everything works expected except adding in tax. thought adding 

$woocommerce->cart->tax_total

would trick, value returning 0.

is there way calculate tax before fee calculated?

i'm not sure if correct way handle issue.

but, i've got working solution problem.

i calculated tax , added fee calculation.

add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' ); function woocommerce_custom_surcharge() { global $woocommerce;  if ( is_admin() && ! defined( 'doing_ajax' ) )     return;      $percentage = 0.03;     $taxes = array_sum($woocommerce->cart->taxes);     $surcharge = ( $woocommerce->cart->cart_contents_total + $woocommerce->cart->shipping_total + $taxes ) * $percentage;        // make sure return false here.  can't double tax people!     $woocommerce->cart->add_fee( 'processing fee', $surcharge, false, '' );  }

i got following line woocommerce documentation. taking care set taxable variable false not double tax people. 

$taxes = array_sum($woocommerce->cart->taxes);

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