Register your username with the consumer key and consumer secret of your connected app configuration. This will provide you with a security token to store with your org to authenticate your callout to this service. Pass the token with any outbound call to this PMS RESTful web service as part of the header (with key named token). You can register your connected app as many times as you need for a specific username. Remember, connected apps may take awhile to propagate after you create them, so be patient.
The first step is to log into your DE org so that we can identify who you are.