https://technotip.com/9370/send-sign-...
In this video tutorial we will show you how to fetch user_token once the user signs the first sign request.
Once we get the user_token we can send future sign requests as push notification directly to the particular users phone, which has XUMM app installed.
Btw, user_token, options, custom_meta etc are specific to XUMM platform and has nothing to do with XRP Ledger Transaction Specifications.
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