The referenced transaction does not meet the criteria for issuing a credit

Question

I try to make a refund transaction via my django app using code:

class Handler():

    def __init__(self):
        self.initial_values = {
            'x_login': settings.API_LOGIN,
            'x_tran_key': settings.TRANS_KEY,
            'x_delim_data': 'TRUE',
            'x_relay_response': 'FALSE',
            'x_version': '3.1',
        }

    def send_AIM_credit(self, amount):
        self.amount = amount
        self.additional_values = {
            'x_type': 'CREDIT',
            'x_card_num': '370000000000002',
            'x_amount': '123',
            'x_description': "Refund",
            'x_trans_id': 'someid'
        }
        result = self.__send_AIM_request() 
        if result[0] in ['3', '2']:
            raise Exception("ERROR %s" % result[2], result[3])
        return result 

    def __send_AIM_request(self):
        self.initial_values.update(self.additional_values)
        logging.info(self.initial_values)
        params_string = urllib.urlencode(self.initial_values)
        response = urllib2.urlopen(settings.AIM_URL, params_string).read()
        response_list = response.split(',')
        logging.info(response_list)
        return response_list

I am sure that transaction which I want to refund is allowed to do that because i have refund option in authorize.net website for it. Why I cannot do that in my app? maybe something is missing?

AIM_URL = 'https://test.authorize.net/gateway/transact.dll'

Moreover in documentation i read that I don`t need full card number for credit transaction, only last 4 digits. But when I use only last 4 digits I get response that transaction cannot be found

Answer 1

The problem was with security keys which I use to communicate with authorize.net I was able to make transactions but not to refund them. When I generated new keys the problem disappeared.