code: public List<Branch> getBranches(Object projectIdOrPath, int page, int perPage) throws GitLabApiException {
          Response response = get(Response.Status.OK, getPageQueryParams(page, perPage), "projects",
                  getProjectIdOrPath(projectIdOrPath), "repository", "branches");
          return (response.readEntity(new GenericType<List<Branch>>() {}));
      }
docs: Get a list of repository branches from a project, sorted by name alphabetically.
  
  <pre><code>GitLab Endpoint: GET /projects/:id/repository/branches</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param page the page to get
  @param perPage the number of Branch instances per page
  @return the list of repository branches for the specified project
  @throws GitLabApiException if any exception occurs