Hi,
Please be aware that this forum is meant for general questions about Google App Engine.
That being said, please refer to this
documentation to start using the Display & Video 360 API. If you have an existing GCP project, you can enable the API
here. After enabling it, you can use the
client libraries of supported programming languages to send requests and parse the responses. If you have any technical issues while setting it up, I suggest posting your questions to
StackOverflow.