curl -X GET https://api.box.com/2.0/retention_policies \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'

BoxCollectionMarkerBased<BoxRetentionPolicy> policies = await client.RetentionPoliciesManager
    .GetRetentionPoliciesAsync();

Iterable<BoxRetentionPolicy.Info> policies = BoxRetentionPolicy.getAll(api);
for (BoxRetentionPolicy.Info policyInfo : policies) {
	// Do something with the retention policy.
}

retention_policies = client.get_retention_policies()
for policy in retention_policies:
    print('The policy ID is {0} and the name is {1}'.format(policy.id, policy.policy_name))

client.retentionPolicies.getAll({ policy_name: 'Tax' })
	.then(policies => {
		/* policies -> {
			entries: 
			[ { type: 'retention_policy',
				id: '123456789',
				name: 'Tax Documents' } ],
			limit: 100,
			next_marker: 'someMarkerString' }
		*/
	});