title: Google play store IAP Billing unavailable for this package and user
body: <p>We are developing an app with IAP Items with google play store, On Some devices, we can't make the paying page show, and from the logcat there is :</p>
  
  <pre><code>2020-01-02 20:23:46.291 16104-16155/com.mycompany.myapp I/UnityIAP: Starting in-app billing setup.
  2020-01-02 20:23:46.319 16104-16104/com.mycompany.myapp I/UnityIAP: Billing service connected.
  2020-01-02 20:23:46.325 16104-16320/com.mycompany.myapp I/UnityIAP: invoking callback
  2020-01-02 20:23:46.325 16104-16320/com.mycompany.myapp I/UnityIAP: Checking for in-app billing 3 support.
  2020-01-02 20:23:46.341 12886-13114/com.android.vending I/Finsky: [2139] gcv.d(3): com.mycompany.myapp: Account determined from installer data - [tvj6t7d7SJBbFycvTAtq3A9mYaQ3F08RzOqtlSgP5J8]
  2020-01-02 20:23:46.341 12886-13114/com.android.vending I/Finsky: [2139] gcv.d(14): com.mycompany.myapp: Account from preferred account - [tvj6t7d7SJBbFycvTAtq3A9mYaQ3F08RzOqtlSgP5J8]
  2020-01-02 20:23:46.356 12886-13114/com.android.vending W/Finsky: [2139] gcg.a(357): Billing unavailable for this package and user.
  </code></pre>
  
  <p>What could possibly cause this problem?</p>