curl --request POST \
  --url https://api.opencard.io/api/v1/application/accounts/{accountId}/tpas/{tpaId}/signatories \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "ceo@acme.se",
  "name": "Anna Andersson"
}
'

{
  "id": 7,
  "email": "ceo@acme.se",
  "name": "Anna Andersson",
  "tpa_id": 42,
  "signed": false,
  "signed_at": null
}