code: public OvhPortabilityDocument billingAccount_portability_id_document_documentId_GET(String billingAccount, Long id, Long documentId) throws IOException {
  		String qPath = "/telephony/{billingAccount}/portability/{id}/document/{documentId}";
  		StringBuilder sb = path(qPath, billingAccount, id, documentId);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, OvhPortabilityDocument.class);
  	}
docs: Get this object properties
  
  REST: GET /telephony/{billingAccount}/portability/{id}/document/{documentId}
  @param billingAccount [required] The name of your billingAccount
  @param id [required] The ID of the portability
  @param documentId [required] Identifier of the document