Missing Ds_Card_Number in response MERCHANT_PARAMETERS_MAP

[Malberix]

Hi,

I'm using it in my project and notice that response returns error trying to retrieve Ds_Card_Number, so I wasn't able to check payment status.
I've solved it just modifying response.py

1: Adding the var:
CARD_NUMBER = "Ds_Card_Number"

2: including it into MERCHANT_PARAMETERS_MAP:

MERCHANT_PARAMETERS_MAP = {
"response": RESPONSE,
"date": DATE,
"hour": HOUR,
...
"card_number": CARD_NUMBER
}

Regards.

[ddiazpinto]

That you for the report. If you want, you can fix it making a PR ;)