Hey @JorgeTigre,
The error you're encountering indicates that an expected credential is missing in your request to the Visa API. This typically means that a necessary header or parameter for authentication has not been included.
To resolve this issue, ensure that you are including all required credentials in your request. Here are some steps you can follow:
1. Authentication: Make sure you are using the correct authentication method. Visa APIs usually support two methods of authentication: `mutual SSL` and `API Key - Shared Secret (x-pay-token)`. Ensure you are correctly implementing one of these methods.
2. Required Headers:
- x-pay-token: If you are using the `API Key - Shared Secret` method, you need to include a correctly generated `x-pay-token` header.
- Mutual SSL Authentication: If you are using mutual SSL, ensure your certificate and private key are correctly configured in your request.
3. API Key: Make sure the API Key is included in the URL of the request as a query parameter.
Here is an example of how a request using `x-pay-token` should look:
```python
# START
import requests
import time
import hmac
import hashlib
import base64
# Your API Key and Shared Secret
api_key = 'YOUR_API_KEY'
shared_secret = 'YOUR_SHARED_SECRET'
# Generate the x-pay-token
def generate_x_pay_token(api_key, shared_secret, resource_path, query_string, request_body):
timestamp = str(int(time.time() * 1000))
pre_hash_string = timestamp + resource_path + query_string + request_body
hash_string = hmac.new(shared_secret.encode('utf-8'), pre_hash_string.encode('utf-8'), hashlib.sha256).digest()
x_pay_token = api_key + ':' + timestamp + ':' + base64.b64encode(hash_string).decode()
return x_pay_token
resource_path = '/vbs/dapi/v1/transaction_enhanced'
query_string = 'apikey=' + api_key
request_body = '{}'
x_pay_token = generate_x_pay_token(api_key, shared_secret, resource_path, query_string, request_body)
headers = {
'Content-Type': 'application/json',
'x-pay-token': x_pay_token
}
url = 'https://sandbox.api.visa.com' + resource_path + '?' + query_string
response = requests.post(url, headers=headers, data=request_body)
print(response.status_code)
print(response.json())
# END
```
Make sure to replace `'YOUR_API_KEY'` and `'YOUR_SHARED_SECRET'` with your actual credentials.
If you are using mutual SSL authentication, make sure to properly configure your certificate and private key in the HTTP request.
Thanks,
Diana
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