class Infrabot(Skill):
  stripe = config['endpoint_url'].split('.')[1]

  async def _is_validjwt(self, opsdroid, config, message):
    _LOGGER.info(f"Checking for valid JWT token")
    return message.user in self.opsdroid.memory

if I add a breakpoint via

  async def _is_validjwt(self, opsdroid, config, message):
    _LOGGER.info(f"Checking for valid JWT token")
    breakpoint()
    return message.user in self.opsdroid.memory

and start trying to mess around, nothing makes sense

(Pdb) await self.opsdroid.memory.get("lwhalen") 
*** SyntaxError: 'await' outside function

(Pdb) self.opsdroid.memory.get("lwhalen") 
<coroutine object Memory.get at 0x1118af290>
/Users/lwhalen/Library/Application Support/opsdroid/opsdroid-modules/skill/infra-api/__init__.py:1: RuntimeWarning: coroutine 'Memory.get' was never awaited
  from opsdroid.skill import Skill
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

Instead of doing return message.user in self.opsdroid.memory you will hVe to do await self.opsdroid.memory.get() if you have a big list of names you can assign a variable on that expression and then do the return message.user in <var name>

I have built a skill that uses opsdroid memory heavily want to have a look at it?

  async def _is_validjwt(self, opsdroid, config, message):
    _LOGGER.info(f"Checking for valid JWT token for {message.user}")
    jwt = await self.opsdroid.memory.get(message.user)
    if jwt is None:
      _LOGGER.info(f"No token found")
      return False
    else:
      _LOGGER.info(f"found token")
      return True