Api not work worldfilia HTTP POST REQUEST

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I work as an affiliate and would like to try to create an API request for the service I use.
Let me explain what I would like to do and how I tried to do it.

The steps are simple.
1.Page with a form on my website with my hosting.
2.Form that sends the data to the “postman”…I guess :slight_smile:
3.The postman sends the data to the service I use.

For example within the affiliate program I use I see an API section with this URL that would be called POST “Credo”.

HTTP POST REQUEST
https://network.worldfilia.net/manager/inventory/buy/bgood_hairwig.json

Then he tells me to pass the parameters and there are a few, but there are necessarily two: the phone and the quantity.

At this point I go into Postman and create a new request.
I insert the url suggested by Worldfilia and add 4 keys with 4 parameters.
When I try to send, and I look into the body gives me a series of errors, as if I had not filled in the phone and the amount.

{“status”:“error”,“errors”:{“phone”:{"_required":“Field must be filled”},“quantity”:{“lengthBetween”:“Il valore deve avere lunghezza compresa tra 0 e 4 caratteri”}}}