code: public OvhDomainUsageAccountStruct domain_account_accountName_usage_GET(String domain, String accountName) throws IOException {
  		String qPath = "/email/domain/{domain}/account/{accountName}/usage";
  		StringBuilder sb = path(qPath, domain, accountName);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, OvhDomainUsageAccountStruct.class);
  	}
docs: usage of account
  
  REST: GET /email/domain/{domain}/account/{accountName}/usage
  @param domain [required] Name of your domain name
  @param accountName [required] Name of account