def sources_list(sources, params):
    """
    Adds defined list of sources to params

    Parameters
    ----------
    sources : list
        Payment sources
    params : dict
        Default params

    Returns
    -------
    dict
        params with sources
    """
    if isinstance(sources, list):
        for source in sources:
            params['sources[{0}]'.format(sources.index(source))] = source
    else:
        raise TypeError('You should use list Type for sources')
    return params