Access API through FireWall - asp.net-core-webapi

I have an API (A) that behind the company fire wall and another api (B) that is public facing.
How would I allow API A and B to communicate?
Thank you

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How do I get a Production API Key?

I am new to Sabre and its products and I am not sure where to turn to for help. I need to get 2 things
A production API Key and
Access to soap API's
Currently, I am not sure how to do either. I have a sabre account with test credentials, but I need production credentials and access to soap API's in order to proceed with building my application. Who should I contact in order to escalate my account privileges?
You have two different ways to get the apiKey.
If you are a solution development company or if you are a travel agency developing your own solution.
If you are a developer company you should contact Saber directly and sign a development agreement with them.
If you are a travel agency developing an integration then you should contact your account executive and request apiKey.
All this access information via SOAP or REST you can find on their website.
https://developer.sabre.com/home

Monitoring how many request by key

I Possible trace how many requests an API key made on my gateway URL?
Because I need to create a report of the API usage.
Thanks
I see you are using google clouds endpoints, in that case it is easier just to go with the google products:
https://cloud.google.com/monitoring/custom-metrics/reading-metrics
Google cloud already provides all the metrics that you need.
Additionally to #Kram's response, if you need to monitor API usage per client (or not only per API key) you will need to create specific one GCP project per API client to able to track it

How to become a developer approved by LinkedIn to use LinkedIn's Connections API?

I would like to use LinkedIn's Connections API to retrieve the 1st degree connections of users registering on my application. But, "The use of this API is restricted to those developers approved by LinkedIn and subject to applicable data restrictions in their agreements.". Has anyone experience in getting approved and what are the main points to consider before applying? And, how can we apply? Thanks!
To access any APIs you'll first need to setup a business page on LinkedIn (instructions here) for app verification then head to the developer page to create an app
To access their restricted APIs you'll want to reach out to their support team via the contact us page and request access; specifically looking for a Relationship Manager if you have an existing business relationship or a Business Development contact per the compliance docs:
The use of these APIs is restricted to developers approved by LinkedIn.
Reach out to your LinkedIn Relationship Manager or
Business Development contact as you will need to meet certain criteria and sign an API agreement with data restrictions
in order to use this integration.

Is Google Place API linked to an email account?

I have a former person that setup my Wordpress website and there is an API entered for Google Place. Is this Google Place API attached to a Google account in which the API could potentially be revoked by this person in the future? Or is the API directly issued by Google? I just want to ensure continuity on my Wordpress without a feature breaking in the future.
The API is connected to the former person's Google account. I am unsure if the person can revoke the API key.
To be on the safe side, make your own API KEY

maps api v3 behind a proxy

i developed an application that is perfectly using maps api.
Today a customer ask me why his google maps is appear completely white on the website, and therefore I discovered that he uses a proxy on his network.
This proxy is set as "deny all" and my customer grants access host by host.
My question is, which host he must enable for allowing that maps api will work correctly?
My website uses API V3,
Thanks
From here:
http://groups.google.com/group/phonegap/browse_thread/thread/3d07771e7708763b
It seems your customer needs to whitelist:
*.googleapis.com
*.gstatic.com

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