curl --request POST \
  --url 'https://app.floral.so/api/v1/workspaces/acme-nordic/events/42/attendance' \
  --header 'Authorization: Bearer $FLORAL_TOKEN' \
  --header 'Idempotency-Key: markEventAttendanceV1-20260816-001' \
  --header 'Content-Type: application/json' \
  --data '{
  "participantIds": [
    "0f8b6c1e-3a52-4d6e-9b7a-2c4e5f6a7b8c",
    "5d2e8a41-7c3b-4f90-8e16-a9b0c1d2e3f4"
  ],
  "state": "ATTENDED"
}'

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    participantIds: ['0f8b6c1e-3a52-4d6e-9b7a-2c4e5f6a7b8c', '5d2e8a41-7c3b-4f90-8e16-a9b0c1d2e3f4'],
    state: 'ATTENDED'
  })
};

fetch('https://app.floral.so/api/v1/workspaces/{workspaceSlug}/events/{eventId}/attendance', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "attendance": {
    "changedParticipantIds": [
      "0f8b6c1e-3a52-4d6e-9b7a-2c4e5f6a7b8c"
    ],
    "state": "ATTENDED",
    "unchangedParticipantIds": [
      "5d2e8a41-7c3b-4f90-8e16-a9b0c1d2e3f4"
    ]
  }
}

{
  "error": {
    "code": "INVALID_INPUT",
    "message": "The request contains invalid values.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "UNAUTHENTICATED",
    "message": "A valid bearer credential is required.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "FORBIDDEN",
    "message": "The credential does not grant this operation.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "The resource was not found.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "CONFLICT",
    "message": "The requested change conflicts with the current resource state.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "RATE_LIMITED",
    "message": "Too many requests. Retry shortly.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "INTERNAL_ERROR",
    "message": "An unexpected error occurred.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}