Install a GooglePlay located App from NFC

Question

Working with Lollipop, I have a device-owner app that is installed with NFC at provision time.
What I need now is to handle automatic updates for my App, from

Answer 1

You need to set Base64 encoded SHA1 or SHA256 (from M forward) of the apk in the

EXTRA_PROVISIONING_DEVICE_ADMIN_PACKAGE_CHECKSUM

field when provisioning through NFC otherwise the provisioned device will not accept the URL for download.

Also see this answer for properly encoding the checksum.