What type of role should you assign for your published REST services documents in security?

Assigning a module role to published REST services documents ensures that the access to those services is governed by the specific rules defined within that module. Module roles are intended to provide access to resources related to a particular module in Mendix. This encapsulation allows for better security and management of permissions tailored to the functionalities offered by the service.

When you assign a module role, you can effectively limit or grant access to only those users who require it for that particular module, promoting a principle of least privilege. This role can manage permissions for various entities and operations, making it an appropriate choice for REST services where you may want to finely control who can access specific data or operations based on their responsibilities within the application.

In contrast, the admin role would provide excessive permissions, potentially undermining security by allowing broader access than necessary. The user role may not provide the needed granularity for managing access to the REST services. A read-only role suggests that users can only access data without making any changes, which might not align with the intended use of REST services in a more interactive scenario where different levels of access are needed. Therefore, a module role is the most suitable choice to maintain the necessary control and security around published REST services.