code: public ServiceFuture<IntegrationAccountAgreementInner> createOrUpdateAsync(String resourceGroupName, String integrationAccountName, String agreementName, IntegrationAccountAgreementInner agreement, final ServiceCallback<IntegrationAccountAgreementInner> serviceCallback) {
          return ServiceFuture.fromResponse(createOrUpdateWithServiceResponseAsync(resourceGroupName, integrationAccountName, agreementName, agreement), serviceCallback);
      }
docs: Creates or updates an integration account agreement.
  
  @param resourceGroupName The resource group name.
  @param integrationAccountName The integration account name.
  @param agreementName The integration account agreement name.
  @param agreement The integration account agreement.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object