code: public String getPullRequestAttachmentEndpoint(Object projectIdOrKey, Object repoIdOrName, Object number, Object attachmentId) {
          return buildEndpoint("projects/" + projectIdOrKey +
                  "/git/repositories/" + repoIdOrName +
                  "/pullRequests/" + number +
                  "/attachments/" + attachmentId);
      }
docs: Returns the endpoint of attachment file.
  
  @param projectIdOrKey the project identifier
  @param repoIdOrName the repository name
  @param number the pull request identifier
  @param attachmentId the pull request attachment identifier
  @return the endpoint