Correct. You must upgrade to a paid account to access Oracle Support.

Explanation
You can create and manage resources in the following ways:
Oracle Cloud Infrastructure ConsoleThe Console is an intuitive, graphical interfacethat lets you create and manage your instances, cloud networks, and storage volumes, as well as your users and permissions.
See Using the Console.
Oracle CloudInfrastructure APIsThe Oracle Cloud Infrastructure APIs are typical REST APIs that use HTTPS requests and responses. See API Requests.
SDKsSeveral Software Development Kits are available for easy integration with the Oracle Cloud Infrastructure APIs, including SDKs for Java, Ruby, and Python. For more information, see Developer Resources.
Command Line Interface (CLI)You can use a command line interface with some services. For more information, see Developer Resources.
TerraformOracle supportsTerraform. Terraform is "infrastructure-as-code" software that allows you to define your infrastructure resources in files that you can persist, version, and share. For more information, see Getting Started with the Terraform Provider.
AnsibleOracle supports the use of Ansible for cloud infrastructure provisioning, orchestration, and configuration management. Ansible allows you to automate configuring andprovisioning your cloud infrastructure, deploying and updating software assets, and orchestrating your complex operational processes.
For more information, see Getting Started with Ansible for Oracle Cloud Infrastructure.
Resource ManagerResource Manager is an Oracle Cloud Infrastructure service that allows you to automate the process of provisioning your Oracle Cloud Infrastructure resources. It helps you install, configure, and manage resources using the "infrastructure-as-code" model. For more information, see Overview of Resource Manager.

Explanation
OracleCloud Infrastructure Key Management is a managed service that enables you to encrypt your data using keys that you control.