>I'd not heard of Postman-Token but it appears that it is there to ensure a unique request. Looking at this example seems to indicate you could just use a new GUID as a unique value ? :
>http://stackoverflow.com/questions/36883046/what-is-the-postman-token-in-generated-code-from-postman.
>
>Re: number of tries : is the server expecting such data ?
>If it is for your own use and the server returns the same Postman-Token then maybe you could concatenate the try number value to the GUID ?

Sounds like Postman is an application that can be helpful in developing and testing API

https://www.getpostman.com/docs/introduction

I'll see if I need it.

Did you see my other thread, BTW?

For tries my colleague wrote the following:

tnRetries: If no response in the timeout period, the number of times to attempt contact with CityPASS. If it was a DNS lookup failure or other glaring connection issue, then retries can be bypassed..

So, I suspect I need to somehow create a loop? I don't think there is a property of the header for number of tries.