Each resource within the OpenStack SDK has a set of properties that can be used when creating a resource.

For example:

example_network = conn.network.create_network(
    name='openstacksdk-example-project-network')

example_subnet = conn.network.create_subnet(
    name='openstacksdk-example-project-subnet',
    network_id=example_network.id,
    ip_version='4',
    cidr='10.0.2.0/24',
    gateway_ip='10.0.2.1')

Also as you've noted in the question, you can review the OpenStack API documentation for the possible parameters in the request body.

But as you found out, the API documentation and/or the SDK resource properties may not give you a complete list. If you are using the master branch of the code then the API documentation and the SDK code may not yet be updated to reflect recent changes. Also, there could simply be bugs with incorrect or missing information (submit bug reports to https://bugs.launchpad.net/openstack/). As a result, the most accurate information is available by looking at the neutron code (see https://github.com/openstack/neutron).

This is what i have used and works for me,

pool = {'lb_method': 'ROUND_ROBIN', 'name': self.lb_pool_name, 'protocol': 'HTTP', 'description': "my lbaas pool", 'subnet_id': self.snet_id, 'provider': self.lbaas_provider, 'admin_state_up': True}

body = {'pool': pool}

Obviously you need to replace the parameters matching your environment.