Google Ads API v26 released with breaking changes to hotel bid modifiers and conversion settings

Google released Google Ads API v26, a major version, on October 14, 2026. It includes breaking changes such as removal of the enhanced_conversions_for_leads_enabled field, renamed vertical-agnostic booking criteria in AdGroupBidModifier, and required country_code and listing_id for Local Services Performance Max campaign creation.

Impact

Teams with integrations on earlier versions need to migrate before their version is sunset. Code reading the removed Enhanced Conversions for leads field or the hotel-specific bid modifier fields must be updated for v26. Campaign creation flows for Local Services Performance Max will fail without the newly required fields. The relaxed EU political advertising declaration may simplify campaign creation for non-EU targeting.

Recommendations

Review the v26 breaking changes table and test your integration in a non-production account before upgrading.
Replace use of enhanced_conversions_for_leads_enabled with ConversionTrackingSetting.enablement_setting.
Update hotel bid modifier code to the vertical-agnostic criterion fields and the DateSelectionType enum.
Add country_code and listing_id to any Local Services Performance Max creation workflow.

Source: Google Ads API release notes