//Add this to your functions.php then use the shortcode [assinantes] to show your list numbers

function assinantes_madmimi() {
  $transient = get_transient( 'assinantes_madmimi' );
  if( ! empty( $transient ) ) {
   return $transient;
  } else {
  $username = "your email at madmimi";
  $apikey = "your api key";
  	$response = wp_remote_retrieve_body( wp_remote_get( "https://api.madmimi.com/audience_members.json?username=$username&api_key=$apikey" ) );
	$json = json_decode( $response, true );
	$assinantes = number_format($json[count], '0',',','.');
  
    set_transient( 'assinantes_madmimi', $assinantes, HOUR_IN_SECONDS );
    
    return $assinantes;
    
  }
  
}

add_shortcode( 'assinantes', 'assinantes_madmimi' );