Hi - i’m really a beginner 
we are trying to work on a new project to realize Graphics TV using the API of Singular.live from a 3rd Party API (GPS tracking data) to put as an overlay for example in real time the speed of the athlete.
I discussed with the support of singular to work with their data stream, and they advise me to use the postman service to send data into their API, “using fetch method & node.js”.
It’s like Chinese for me 
I have these raw data:
https://racemap.com/api/data/v1/61a21210e5d45d000199f7d9/current
And I want to put the datas to this url :
If I send static data, for example:
{
“matchClock”:“12:32”
}
It works and Singular receive my “matchClock”. But i don’t understand how I can set the “fetch method” into postman to send them all my dynamic data from this feed:
https://racemap.com/api/data/v1/61a21210e5d45d000199f7d9/current
Is there here a nice people who can help me to configure correctly the postman service, please?
The doc of the API of singular is here:
Mickael