SubmitResult

type SubmitResult = 
  | SubmitResultSuccess
  | SubmitResultError;

Submit result from the SecureFields SDK.

This is a strict discriminated union — an empty object {} does not satisfy any branch. Use 'error' in result (or isSubmitError) to distinguish failures from successes, then use 'birth_date' in result / 'vault_form_token' in result to narrow the success variant.