Sending downlink to the device

Sending downlink to the device

Hi,
I'm able to send an uplink from the loradevice to the connection that is created on the actility platform.
I would like to send a downlink to the device.  

Is this the right API to use to send downlinks ?

and the right way for bearer token generation ?
SHA-256(DevEUI=000000000F1D8693&FPort=1&Payload=00&AS_ID=app1.sample.com &Time=2016-01-11T14:28:00.333+02:0046ab678cd45df4a4e4b375Eacd096acc)

not sure if it is related to enterprise or community edition.
probably a pointer/link to the topic available for community edition would be of great help.