Get the calling key's credit balance

{
  "accountId": "string",
  "creditsCents": 0,
  "spentCents": 0
}

{
  "error": "unauthorized",
  "message": "string",
  "signupUrl": "string"
}

{
  "error": "forbidden",
  "message": "string",
  "requiredScope": "string",
  "grantedScopes": [
    "string"
  ]
}

{
  "error": "upstream_error",
  "message": "string",
  "retryable": true
}

{
  "error": "rate_limited",
  "message": "string",
  "retryAfter": 0
}

{
  "error": "upstream_error",
  "message": "string",
  "retryable": true
}

{
  "error": "upstream_error",
  "message": "string",
  "retryable": true
}