How to define X-EBAY-API-IAF-TOKEN in python?

[sh0552]

I'm new to this api and trying to access the shopping api with python. It requires me to set an HTTP header of 

X-EBAY-API-IAF-TOKEN. How should I set it?

Currently I'm setting it like this:

```

api = Shopping(appid = PRODUCTION_APPLICATION_ID, config_file = None)

api.execute('GetSingleItem', {"itemId" : iid,

"X-EBAY-API-IAF-TOKEN" : OATH_TOKEN})

response = api.response_dict()

```

It's throwing me this error: ConnectionError: 'GetSingleItem: Class: RequestError, Severity: Error, Code: 1.33, Token not available in request.Token not available in request. Please specify a valid token as HTTP header., Class: RequestError, Severity: Error, Code: 10.1, Please specify a query!Please specify a query!'

[shipscript]

Using the Shopping API is a two step process, each requiring credentials. 

The first step is to submit your base64 developer credentials  (clientID:clientSecret)  to generate a new OAuth token, which expires within 2 hours, or to refresh an expiring token that has been stored on your website for that purpose. eBay prefers that developers reuse a token until it expires, rather then generating a new token for each call.

https://developer.ebay.com/api-docs/static/oauth-client-credentials-grant.html

The second step is to make a call to the Shopping API using that token in the header.

X-EBAY-API-IAF-TOKEN : token_string

I have a fully working PHP example here, which may help you work through the logic and help to create the headers for both steps.

https://community.ebay.com/t5/Token-Messaging-Sandbox-related/Sample-PHP-for-generating-and-renewing...