Fragment value in app link like vk.com/app{app_id}_-654321#hash
Fragment value in app link like vk.com/app123456_-654321#{hash}
Label for button
Fragment value in app link like vk.com/app123456_{owner_id}#hash
Additional data sent along with message for developer convenience
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Fragment value in app link like vk.com/app{app_id}_-654321#hash