private function getCustomParamsString()
    {
        $customParams = $this->getCustomParamsArray();
        foreach ($customParams as $key => $value) {
            $customParams[$key] = $key . '=' . $value;
        }
        return implode(':', $customParams);
    }
private function getCustomParamsString()
    {
        $customParams = $this->getCustomParamsArray();
        foreach ($customParams as $key => $value) {
            $customParams[$key] = $key . '=' . $value;
        }
        return implode(':', $customParams);
    }
private function getCustomParamsString ( ) { $ customParams = $ this -> getCustomParamsArray ( ) ; foreach ( $ customParams as $ key => $ value ) { $ customParams [ $ key ] = $ key . '=' . $ value ; } return implode ( ':' , $ customParams ) ; }
Returns custom parameters for signature.

@return string
Returns custom parameters for signature .