PayFast Python Integration

[Tawanda Abraham Makunike]

Good day guys. 

I am working on an ecommerce platform built on Django and I have been trying to integrate with the PayFast  API. I am facing a problem when I submit the form to payfast. I cant seem to generate the signature in the way payfast accepts. The code for generating the signature below is part of my fork of the django-payfast app that I downloaded. I have been working on updating it as a lot has changed since its last update.

from hashlib import md5

import urllib2

import logging

from urllib import urlencode

from collections import OrderedDict

  

POSTBACK_URL = '/eng/query/validate'

POSTBACK_SERVER = 'https://www.payfast.co.za'

  

def _values_to_encode(data):

    return [

        (k, unicode(data[k]).strip().encode('utf8'),)

        for k in data if data[k] and k != 'signature'

    ]

  

def _signature_string(data):

    values = _values_to_encode(data)

    return urlencode(values)

def signature(data):

    """

   Calculates PayFast signature.

   'data' should be an OrderedDict instance.

    """

    text = _signature_string(data)

    print text

    return md5(text).hexdigest()

The data that I am passing into the signature method is an Ordered Dictionary so that the sequence of the keys is maintained, this is how I am building the dictionary

def get_data():

data = OrderedDict()

data['merchant_id'] = 'XXXXXXXXX'

data['merchant_key'] = 'XXXXXXXXX'

data['return_url'] = 'http://example.com/cart/success/'

data['cancel_url'] = 'http://example.com/cart/cancelled/'

data['notify_url'] = 'http://example.com/cart/process/'

data['email_address'] = 'paym...@example.com'

data['m_payment_id'] = '2'

data['amount'] = '234'

data['item_name'] = 'Order'

data['item_description'] = 'Some description here'

The order above is per PayFast specifications on their website. I am kindly asking for any assistance if there is someone who has worked with the api before, I am planning also on releasing the fork I am working on to the public once it has worked and hopefully rally some devs for active maintenance which I am committing to personally.

Any help is greatly appreciated.

[Mandla Mbuli]

Hi Tawanda

PayFast? NICE, as consumer, I use it on Takealot all the time. Haven't used it as a dev though.

Looking at the docs for django-payfast, it sounds like you're not supposed to generate the signature

yourself.

> merchant_id’, ‘merchant_key’, ‘notify_url’ and ‘signature’ params are handled automatically.

Do you have link to the latest developer docs for payfast which lists the parameters for the API?

--
Leonard Mandla Mbuli
email:ma...@mandla.me

website: http://mandla.me

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