Adding users to Synapse

(a very good Matrix Server)If you've dockerised synapse, then enter the container with 

docker exec -it synapse-synapse-1 /bin/bash

Be sure to use the name of your container here. 

Now use the command line options to create a user: 

 # register_new_matrix_user -c /data/homeserver.yaml http://localhost:8008
New user localpart [root]: GEN
Password:
Confirm password:
Make admin [no]: yes
Sending registration request...
Success!

Remember to specify the location of your homeserver.yaml file and the correct IP/Port for your server. If you want to obtain the access token for any existing user then use:

# curl -XPOST "http://localhost:8008/_matrix/client/r0/login" \
 -H "Content-Type: application/json" \
 -d '{
 "type": "m.login.password",
 "user": "GEN",
 "password": "qy35q35yq35yq35yq35y"
 }'
{"user_id":"@gen:im.somewhere.uk","access_token":"qh345q5hq45hq4h5q345hehtdsfhsrh","home_server":"im.somewhere.uk","device_id":"MIBJGERGGEA"}

Again, change your user and password as needed.