Service ID is its unique number in YCLIENTS. There are two ways to determine the service ID:
1. Go to Settings - Services, select a service.
A link of the form appears in the address link:
https://yclients.com/settings/services/service_in_category/edit/126359/1682526/1682604/, where 1682604 is the service ID.
2. Go to the Settings - Services, select the category of services. Click the Operations with Excel - Upload to Excel button, open the file with the upload. The first column will indicate the service ID.