This filter can be used to check if the discount is active or not. The filter accepts two parameters: It returns true or false.
return apply_filters( ‘rpress_is_discount_active’, $return, $this->ID );
The sample below shows an example of how you could modify it:
function rpress_is_discount_active_callback( $return, $id ) {
return $return = true;
}
add_filter( 'rpress_is_discount_active', 'rpress_is_discount_active_callback', 10, 2 );