AdWords API v201607 will be sunset on June 27th, 2017, after which all v201607 API requests will begin to fail. This version was deprecatedon February 28th, 2017. If you are still on v201607, we recommend that you skip v201609 and v201702 and migrate directly to v201705. Please be sure to migrate prior to the sunset to ensure your API access is unaffected.
We've prepared various resources to help you with the migration:
As always, if you have any questions about this migration, please contact us via the forum.