The URL parameter ":serviceId" can be used in two ways:

• use the unique ID of the service assigned by TIMIFY ("serviceId"). In this case, you don't need the QUERY parameter "external"
• use the "externalId" that you added to this service. In this case, you need to add the parameter "external" ( for ex.: /?external=1) so the Developer API will search by your "externalId" and not by "serviceId" assigned by TIMIFY

You can add "externalId" to the service with the Developer API endpoints POST /services and PATCH services/:serviceId

When the developer wants to include booking limit suggestions in the response, the booking limitation params needs to be be included in the query, only the start_date is mandatory

  ?start_date=2019-02-23 11:30&event_id=645515845089ba22acfa569e&durations_pattern=5&duration_before=30&duration_after=30