Plaid Exchange the Link Correlation Id for a Link Token

Exchange an OAuth `link_correlation_id` for the corresponding `link_token`. The `link_correlation_id` is only available for 'payment_initiation' products and is provided to the client via the OAuth `redirect_uri` as a query parameter. The `link_correlation_id` is ephemeral and expires in a brief period, after which it can no longer be exchanged for the 'link_token'.