@client.command(pass_context=True)
async def link(ctx):
    server = client.get_server("server_id")
    link = client.create_invite(destination=server,xkcd=True,max_age=0,max_uses=number)
    await client.say(link)
    #max_age=0-> Never expire link
    #max_uses-> limit to usage the link
    #xkcd-> The URL fragment used for the invite if it is human readable.