helloworld.py - How to run Python Sample Code using the Hello World API and X-Pay-Token

shameem
Visa Employee

helloworld.py - How to run Python Sample Code using the Hello World API and X-Pay-Token

In this "How-to" guide we will show you how to run the “Hello World” project using Visa Hello World API and and API Key - Shared Secret Authentication. The Hello World API is a simple API for testing the connectivity with the Visa Network.

 

Important Links:

 

 

How to Create a Visa Developer Project

 

Before you are able to run the “Hello World” Project, you must create a Visa Developer Portal (VDP) project and get credentials. If you haven't registered yet just click on register here, fill out the account information, agree to the terms and conditions and click on receive emails. Once you have successfully activated your account, you will see your dashboard and you are ready to go.

 

 

java1.png

 

 

Once you are there, click on create your first project if this is your first project.  On the next page, you will be asked for details, such as project name, description and a list of APIs to choose from.

 

 

Java2.png

 

For this tutorial, we're going to select CyberSource Payments and click create project.

 

 

CyberSourcePaymentMethod.png

 

 

 

How to get Credentials

 

After creating your project, you will be redirected to the project summary page. You can obtain your project credentials by browsing the left side navigation menu of your project and click on “Credentials”.

 

 

Java4.png

 

What is required for the X-Pay-Token Authentication?

 

To be able to make an API call with X-Pay-Token Authentication, you need to have the following:

  1. Api Key
  2. Secret Key

CredentialsForXPayToken.png

 

How to run the Python Sample code of the “Hello World API” using PyCharm

 

 

Next, we'll show you how to run the Python sample code of the “Hello World API” using PyCharm. PyCharm is a dedicated Python Integrated Development Environment (IDE) providing a wide range of essential tools for Python developers and can be downloaded using below link:

 

https://www.jetbrains.com/pycharm/download

 

In PyCharm, a project helps you organize your source code, tests, libraries that you use, build instructions, and your personal settings in a single unit.

 

Step 1 - Launch PyCharm

 

  • On the PyCharm Welcome Screen, click Create New Project.

2020-11-12_17-17-13.png

 

Otherwise, from the main menu, select File | New | Project

 

Step 2 - In the New Project wizard, select Pure Python from the list on the left, provide the project Location and click Create.

 

Please make sure to specify your “Project  Interpreter”

 

2020-11-12_17-18-05.png

 

 

Step 3 - Create a new file and named it “helloworld.py

 

2020-11-12_17-22-08.png

 

 

Step 4 - Copy the below sample code to the “helloworld.py” file

 

  • Install all the required dependencies when prompt.
  • Set the below parameters:

api_key = '<YOUR API KEY>'

shared_secret = '<YOUR SHARED SECRET KEY>'

 

 

 

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#
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#

import datetime
import hashlib
import hmac
import json
import logging
from calendar import timegm

import requests

# DEBUG = False
DEBUG = True


# helloworld
# Sample Code for API Key- Shared Secret (X-Pay-Token)

# These two lines enable debugging at httplib level (requests->urllib3->http.client)
# You will see the REQUEST, including HEADERS and DATA, and RESPONSE with HEADERS but without DATA.
# The only thing missing will be the response.body which is not logged.
try:
    import http.client as http_client
except ImportError:
    # Python 2
    import httplib as http_client
http_client.HTTPSConnection.debuglevel = 0

# You must initialize logging, otherwise you'll not see debug output.
logging.basicConfig()
logging.getLogger().setLevel(logging.DEBUG)
requests_log = logging.getLogger("requests.packages.urllib3")
requests_log.setLevel(logging.DEBUG)
requests_log.propagate = True

print("START Sample Code for API Key- Shared Secret (X-Pay-Token)")

print(datetime.datetime.now())
date = datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S")

url = 'https://sandbox.api.visa.com/vdp/helloworld'
headers = {}
body = {}

payload = json.loads('''{}
''')

# THIS IS EXAMPLE ONLY how will user_id and password look like
# api_key = '1WM2TT4IHPXC8DQ5I3CH21n1rEBGK-Eyv_oLdzE2VZpDqRn_U'
# shared_secret = '19JRVdej9'

api_key = '<YOUR API KEY>'
shared_secret = '<YOUR SHARED SECRET KEY>'

timeout = 10

query_string = "apiKey=" + api_key
resource_path = "helloworld"
body = ""

secret = bytes(shared_secret, 'utf-8')
timestamp = str(timegm(datetime.datetime.utcnow().timetuple()))
pre_hash_string = bytes(timestamp + resource_path + query_string + body, 'utf-8')
print(pre_hash_string)
hash_string = hmac.new(secret, pre_hash_string, digestmod=hashlib.sha256).hexdigest()
x_pay_token = 'xv2:' + timestamp + ':' + hash_string
print(x_pay_token)
headers = {'x-pay-token': x_pay_token}

try:
    response = requests.get(url + '?' + query_string,
                            headers=headers,
                            timeout=timeout
                            # if DEBUG: print (response.text)
                            )
except Exception as e:
    print(e)

if DEBUG: print(response.headers)
if DEBUG: print(response.content)

var1 = str(response.status_code)
var2 = '200'
msg = " API Key- Shared Secret (X-Pay-Token) test failed"
assert var1 == var2, msg
print("END Sample Code for API Key- Shared Secret (X-Pay-Token)\n\n")

 

 

 

 

Step 5 - Compile Your Code 

 

  • Simply right click and run “helloworld”

Screen Shot 2020-11-12 at 5.23.31 PM.png

 

 

Want more? Join the Visa Developer Community to get alerts on the latest tutorials, guides and new developer resources. Stay tuned for more in the series. 

 

Written by: @shameem@jmedlen, & @mprsic