def callback_log(callback, api_key):
params = {'<STR_LIT:key>': api_key, '<STR_LIT>': callback}<EOL>resource = '<STR_LIT>' + util.urlencode(params)<EOL>resp = util.call_api(resource, base_url='<STR_LIT>')<EOL>json_resp = json.loads(resp)<EOL>return [LogEntry(e['<STR_LIT>'], e['<STR_LIT>'], e['<STR_LIT>'], e['<STR_LIT>']) for e in json_resp]<EOL>
Call the 'v2/receive/callback_log' endpoint and returns the callback log
    for a given callback URI with parameters.

    :param callback: callback URI
    :param api_key: Blockchain.info API V2 key
    :return: a list of :class:`LogEntry` objects