eBay API integration

I'm looking for a developer to support with eBay api calls, I would like the developer to set up postman examples of eBay seller APIs so I can copy them into my bubble.io web app. Specifically need support on the process of setting up ClientAlerts through ebay seen here https://developer.ebay.com/Devzone/client-alerts/docs/CallRef/Login.html#Request.ClientAlertsAuthToken.Value