Can I use a PayPal donation button in my Android app in Google Play?

I contacted them and they replied as below:

Thank you for contacting the Google Play Team.

I see that your question is regarding accepting donations through
PayPal. Donations may only be collected within an app under certain
conditions:

1. Donations are only permitted for validated non-profit charitable organizations (for example, a validated 501(c)(3) charitable
   organization or the local equivalent).

2. Donations must be facilitated via a web browser, and any collection must be made through a secure payment system.

If you belong to an eligible charitable organization, please follow
these steps:

1. Attach a copy of your organization’s IRS determination letter or other acceptable proof in your reply to this notification. The
   provided information must indicate your status as a charitable
   organization.

2. Ensure your app only facilitates donations via a web browser as specified above.

3. Submit your app for review.

Alternatively, if you are not a charitable organization, you must
remove the donation functionality from your app, or accept payment
through Google Play’s in-app billing service or Paid app distribution
on the Play Store. You can learn more about in-app billing in our Help
Center: http://developer.android.com/google/play/billing/index.html

I hope this helps. Thank you for your support of Google Play.

Regards, Bruce The Google Play Team