code: public static void setPaymentsPublicKey(String publicKey) {
  		PaymentSettings request = new PaymentSettings();
  		request.setPrivacyUrl(publicKey);
  		FbBotMillNetworkController.postThreadSetting(request);
  	}
docs: Sets the payment public key. The payment_public_key is used to encrypt
  sensitive payment data sent to you.
  
  @param publicKey
  the public key to set.
  @see <a href=
  "https://developers.facebook.com/docs/messenger-platform/thread-settings/payment"
  >Facebook's Messenger Platform Payments Thread Settings
  Documentation</a>
  @see <a href=
  "https://developers.facebook.com/docs/messenger-platform/payments-reference#encryption_key"
  >Facebook's Messenger Platform Creating Encryption Documentation</a>
  @since 1.2.0