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<?php

/*remove coupons on every add to cart action*/
add_action('woocommerce_add_to_cart', function() {

   $coupons = WC()->cart->get_applied_coupons( ); // decide to remove or not
   
   if ( isset( $coupons ) ){
    foreach( $coupons as $coupon ){
       WC()->cart->remove_coupon( $coupon );
   }
}

});
?>