Repeated calls to /token

[yespbs]

This api client is calling getToken() on every server call which will result in violation of usage terms as per authorization scheme https://docs.hyphenate.io/docs/server-overview#section-token-expiration when used in a repeat call over a period of time ( 7 days for example ) or within a loop.

Please update the code to use a storage package or similar to store the access_token in storage till it expires, A storage package can be an abstraction layer for SESSION, COOKIE, FILE, DATABASE or a CACHE like memcached, redis etc