code: public String getIssueAttachmentEndpoint(Object issueIdOrKey, Object attachmentId) throws BacklogException {
          return buildEndpoint("issues/" + issueIdOrKey + "/attachments/" + attachmentId);
      }
docs: Returns the endpoint of attachment file.
  
  @param issueIdOrKey     the issue identifier
  @param attachmentId the attachment identifierr
  @return the endpoint
  @throws BacklogException