The external conversion source that is associated with a ConversionAction.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/external_conversion_source.proto)

| Enums ||
|---|---|
| ## `AD_CALL_METRICS` | Conversion that occurs when a user clicks on a call extension directly on an ad; Displayed in Google Ads UI as 'Calls from ads'. |
| ## `ANALYTICS` | Conversion that comes from linked Google Analytics goal or transaction; Displayed in Google Ads UI as 'Analytics'. |
| ## `ANALYTICS_SEARCH_ADS_360` | Conversions that come from Google Analytics specifically for Search Ads 360. Displayed in Google Ads UI as Analytics (SA360). |
| ## `ANDROID_FIRST_OPEN` | Conversion that occurs when a user opens an Android app for the first time; Displayed in Google Ads UI as 'Android app install (first open)'. |
| ## `ANDROID_IN_APP` | Conversion that occurs when a user takes an in-app action such as a purchase in an Android app; Displayed in Google Ads UI as 'Android in-app action'. |
| ## `APP_UNSPECIFIED` | Legacy app conversions that do not have an AppPlatform provided; Displayed in Google Ads UI as 'Mobile app'. |
| ## `CLICK_TO_CALL` | Conversion that occurs when a user clicks on a mobile phone number; Displayed in Google Ads UI as 'Phone number clicks'. |
| ## `DISPLAY_AND_VIDEO_360_FLOODLIGHT` | Conversion that is reported by Floodlight for DV360. |
| ## `FIREBASE` | Conversion that comes from a linked Firebase event; Displayed in Google Ads UI as 'Firebase'. |
| ## `FIREBASE_SEARCH_ADS_360` | Conversion that comes from a linked Firebase event for Search Ads 360. |
| ## `FLOODLIGHT` | Conversions reported by Floodlight tags. |
| ## `GOOGLE_ATTRIBUTION` | Conversion that is controlled by Google Attribution. |
| ## `GOOGLE_HOSTED` | Conversions that track local actions from Google's products and services after interacting with an ad. |
| ## `GOOGLE_PLAY` | Codeless Google Play conversion; Displayed in Google Ads UI as 'Google Play'. |
| ## `IOS_FIRST_OPEN` | Conversion that occurs when a user opens an iOS app for the first time; Displayed in Google Ads UI as 'iOS app install (first open)'. |
| ## `IOS_IN_APP` | Conversion that occurs when a user takes an in-app action such as a purchase in an iOS app; Displayed in Google Ads UI as 'iOS in-app action'. |
| ## `SALESFORCE` | Conversion that comes from Salesforce; Displayed in Google Ads UI as 'Salesforce.com'. |
| ## `SEARCH_ADS_360` | Conversions imported from Search Ads 360 Floodlight data. |
| ## `STORE_SALES` | Store Sales conversion based on first-party or third-party merchant data uploads and/or from in-store purchases using cards from payment networks. Displayed in Google Ads UI as 'Store sales'. |
| ## `STORE_SALES_CRM` | Conversion that comes from in-store purchases recorded by CRM; Displayed in Google Ads UI as 'Store sales (data partner)'. |
| ## `STORE_SALES_DIRECT_UPLOAD` | Store Sales conversion based on first-party or third-party merchant data uploads. Displayed in Google Ads UI as 'Store sales (direct upload)'. |
| ## `STORE_SALES_PAYMENT_NETWORK` | Conversion that comes from in-store purchases from payment network; Displayed in Google Ads UI as 'Store sales (payment network)'. |
| ## `STORE_VISITS` | Conversion that occurs when a user visits an advertiser's retail store after clicking on a Google ad; Displayed in Google Ads UI as 'Store visits'. |
| ## `THIRD_PARTY_APP_ANALYTICS` | Conversion that comes from a linked third-party app analytics event; Displayed in Google Ads UI as 'Third-party app analytics'. |
| ## `UNKNOWN` | Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `UPLOAD` | Website conversion that is uploaded through ConversionUploadService; Displayed in Google Ads UI as 'Import from clicks'. |
| ## `UPLOAD_CALLS` | Call conversion that is uploaded through ConversionUploadService; Displayed in Google Ads UI as 'Import from calls'. |
| ## `WEBPAGE` | Conversion that occurs when a user navigates to a particular webpage after viewing an ad; Displayed in Google Ads UI as 'Website'. |
| ## `WEBSITE_CALL_METRICS` | Conversion that occurs when a user calls a dynamically-generated phone number (by installed javascript) from an advertiser's website after clicking on an ad; Displayed in Google Ads UI as 'Calls from website'. |