code: public OvhPortabilityDocument billingAccount_portability_id_document_POST(String billingAccount, Long id, String description, String name) throws IOException {
  		String qPath = "/telephony/{billingAccount}/portability/{id}/document";
  		StringBuilder sb = path(qPath, billingAccount, id);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "description", description);
  		addBody(o, "name", name);
  		String resp = exec(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, OvhPortabilityDocument.class);
  	}
docs: Create a portability document
  
  REST: POST /telephony/{billingAccount}/portability/{id}/document
  @param description [required] Description of the document
  @param name [required] Document's name
  @param billingAccount [required] The name of your billingAccount
  @param id [required] The ID of the portability