Hi,
Thank you for contacting support. The equivalent for appVendor property in Google Ads API is app_store field of AppCampaignSetting. For your other concern, you could refer to AppCampaignAppStore enum for the replacement of MobileApplicationVendor enum in Google Ads API. Additionally, please keep an eye on our blog post for upcoming changes to App Campaigns. Let us know if you need any additional information.
Regards,
Nikisha Patel, Google Ads API Team