Plaid Retrieve Auth data

The `/processor/auth/get` endpoint returns the bank account and bank identification number (such as the routing number, for US accounts), for a checking or savings account that''s associated with a given `processor_token`. The endpoint also returns high-level account data and balances when available. Versioning note: API versions 2019-05-29 and earlier use a different schema for the `numbers` object returned by this endpoint. For details, see [Plaid API versioning](https://plaid.com/docs/api...