curl --request POST \
  --url https://sandbox.deck.co/api/v1/connection/public_token/exchange \
  --header 'Content-Type: application/json' \
  --header 'x-deck-client-id: <api-key>' \
  --header 'x-deck-secret: <api-key>' \
  --data '{
  "public_token": "<string>"
}'

{
  "access_token": "<string>",
  "connection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "fields": [
    {
      "field_name": "<string>",
      "field_value": "<string>"
    }
  ]
}