Reusable API Call Code (Blocking and Recalling on Token Errors)

1. Multiple API calls are made.

2. Each API contains an authentication token.

3. If a token expiration error is received from the first API,

4. The remaining APIs will also generate errors. To resolve this...

-> When a token authentication expiration error is received from the first API, block the remaining API calls,

and first call the token issuance API.

* Note that Promise.all handles failure of even one API as an overall failure.