Following up here with some additional information, @megstweet123. It looks like selecting an app to promote simply filters the allowable Tweets—that is, Tweets that include app cards for the specific app—in the “Choose your cretives” section of the page.
When using the POST accounts/:account_id/line_item_apps endpoint, the selected app is only propagated to ads.twitter.com when placements=PUBLISHER_NETWORK on the line item. (If it also includes ALL_ON_TWITTER, it will not work.) Here is an example:
# creating the line item
$ twurl -X POST -H ads-api.twitter.com "/1/accounts/18ce54d4x5t/line_items?campaign_id= 9arr7&objective=APP_INSTALLS&product_type=PROMOTED_TWEETS&placements=PUBLISHER_NETWORK&advertiser_domain=twitter.com&categories=IAB11-5&bid_amount_local_micro=500000&paused=true"
{
"data": {
"bid_type": "TARGET",
"advertiser_user_id": 756201191646691328,
"name": "Untitled",
"placements": [
"PUBLISHER_NETWORK"
],
"start_time": null,
"bid_amount_local_micro": 500000,
"automatically_select_bid": false,
"advertiser_domain": "twitter.com",
"target_cpa_local_micro": null,
"primary_web_event_tag": null,
"charge_by": "APP_CLICK",
"product_type": "PROMOTED_TWEETS",
"end_time": null,
"bid_unit": "APP_CLICK",
"total_budget_amount_local_micro": null,
"objective": "APP_INSTALLS",
"id": "9pl99",
"entity_status": "PAUSED",
"paused": true,
"account_id": "18ce54d4x5t",
"optimization": "DEFAULT",
"categories": [
"IAB11-5"
],
"currency": "USD",
"created_at": "2017-08-17T15:50:04Z",
"tracking_tags": [],
"updated_at": "2017-08-17T15:50:04Z",
"include_sentiment": "POSITIVE_ONLY",
"campaign_id": "9arr7",
"creative_source": "MANUAL",
"deleted": false
},
"request": {
"params": {
"placements": [
"PUBLISHER_NETWORK"
],
"bid_amount_local_micro": 500000,
"advertiser_domain": "twitter.com",
"product_type": "PROMOTED_TWEETS",
"objective": "APP_INSTALLS",
"paused": true,
"account_id": "18ce54d4x5t",
"categories": [
"IAB11-5"
],
"campaign_id": "9arr7"
}
},
"data_type": "line_item"
}
# associating an app with a line item
$ twurl_ads -X POST "/1/accounts/18ce54d4x5t/line_item_apps?line_item_id=9pl99&app_store_identifier=com.twitter.android&os_type=ANDROID"
{
"data": {
"line_item_id": "9pl99",
"app_store_identifier": "com.twitter.android",
"id": "1wu1i",
"created_at": "2017-08-17T15:51:19Z",
"updated_at": "2017-08-17T15:51:19Z",
"os_type": "Android",
"deleted": false
},
"data_type": "line_item_apps"
}
When you go to edit the campaign, you can see that the Twitter app has been selected.
As was previously stated, what matters, via the API, is the Tweet that is associated with the line item—it should include an app card with the app you’re interested in promoting.
That being said, there could be value in having the selected app propagate to ads.twitter.com even if the line item includes a placement outside of the Twitter Audience Platform. That’ll be a product decision, though.
Thanks again for reaching out and providing these details.