Change product price on payment screen - wordpress

Question

I would like to change a product's price on the payment gateway screen.
I have tried the woocommerce_before_calculate_totals method, this does not work.
I add the product and then try to update the price :
add_action('wp_loaded', array($this,'add_to_cart'), 10);
add_action( 'woocommerce_before_calculate_totals', array( $this, 'add_custom_price'),22,2);
public function add_custom_price( $cart) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// Avoiding hook repetition (when using price calculations for example)
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
return;
// Loop through cart items
foreach ( $cart->get_cart() as $item ) {
$item['data']->set_price( 40 );
}
}
Testing in the above function shows the price is updated though in the checkout the price remains the same.

Answer 1

You should try to change the last if statement. You might need to use $key => $value here:
add_action( 'woocommerce_before_calculate_totals', array( $this, 'add_custom_price'),22, 1);
public function add_custom_price( $cart) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// Avoiding hook repetition (when using price calculations for example)
if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 ) return;
// Loop through cart items
foreach ( $cart->get_cart() as $key => $item ) {
$item['data']->set_price( 40 );
}
}
Also, it looks like this is in a Class. Try moving this out of your Class into your functions.php file and update the action hook:
add_action( 'woocommerce_before_calculate_totals', 'add_custom_price', 22, 1);
If it works in your functions.php file, then you need to look at how your Class is getting instantiated - especially if it's getting called to late.
Edit:
LoicTheAztec caught the wrong argument count, so answer updated to reflect that.