Pushover App: Error setting up in-app purchase: No SKUs

When trying to pay for the Pushover app ("Settings" -> "Purchase Pushover License") an error message is displayed: Error setting up in-app purchase: No SKUs.

Looking at Logcat:

08-05 20:55:12.516  8687  8719 D GmsMeasureSvcImpl: onTransact [unknown]: 10, android.os.Parcel@2fa70c1, 16
08-05 20:55:12.532 29633 29633 I MessageHistoryActivity: MessageHistoryActivity - got launch intent: pushover://license
08-05 20:55:12.533 29693 29707 E fakestore: getsku
08-05 20:55:12.535 29633 29633 I MessageHistoryActivity: MessageHistoryActivity - onStart: now visible
08-05 20:55:12.541 29633 29633 E ActivityThread: Failed to find provider info for com.teslacoilsw.notifier
08-05 20:55:12.544 29693 29707 E fakestore: getpurchase
08-05 20:55:12.544 29633 29633 I BillingManager: Querying purchases elapsed time: 0ms
08-05 20:55:12.544 29693 29707 E fakestore: getpurchase
08-05 20:55:12.545 29633 29633 I BillingManager: Querying purchases and subscriptions elapsed time: 1ms
08-05 20:55:12.545 29633 29633 I BillingManager: Querying subscriptions result code: 0 res: 0
08-05 20:55:12.545 29633 29633 D BillingManager: Query inventory was successful.
08-05 20:55:12.546 29633 29633 I MessageHistoryActivity: MessageHistoryActivity - onResume: last visible 2 sec(s) ago
08-05 20:55:12.566  8687  8719 D GmsMeasureSvcImpl: onTransact [unknown]: 1, android.os.Parcel@ed3c008, 16
08-05 20:55:12.575 29633 29633 I MessageHistoryActivity: MessageHistoryActivity - received broadcast for new message
08-05 20:55:12.610  8687  8719 D GmsMeasureSvcImpl: onTransact [unknown]: 1, android.os.Parcel@2fa70c1, 16
08-05 20:55:12.615  8687  8719 D GmsMeasureSvcImpl: onTransact [unknown]: 10, android.os.Parcel@ed3c008, 16

Does anyone have an idea what the issue could be?

Start by reproducing the Settings → Purchase Pushover License flow and reviewing the BillingManager and fakestore entries shown in Logcat. Determine why the purchase setup reports “No SKUs”; done means the license purchase flow no longer displays that error.