Often when testing and generating reports it's useful to get the guid of a record. There are lots of ways but the quickest and most reliable is to use the following URL structure calling the dynamics api.

https:// servername/organisationname/api/data/ v8.2/entitynameplural?$ orderby=fieldname&$ select=fieldname&$ filter=contains(fieldname,'Clayton')

Server name and Organisation name

If on premise https://vs123/prod

If online then https://prod.crm11.dynamics.com

V8.2

Can be v8.2 or v9.0 depending on version

Entitynameplural

Name of entity with an s on the end of

$Orderby

Order of the data

Fieldname

Name of field

Select

Fields you want to return if not set all fields are returned

Filter

Example could be contains( Fieldname,'Value')

Example 1

https://bsmt.crm4.dynamics.com/api/data/ v9.0/bsmt_invoiceitems?$ orderby=bsmt_name&$ select =bsmt_ name

Other Examples

https://bsmt.crm4.dynamics.com/api/data/ v9.0/bsmt_invoiceitems?$ orderby=bsmt_name&$ select =bsmt_ name,bsmt_externalemployee&$filter=contains(bsmt_name,'Clayton')

Microsoft Reference

https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/webapi/query-data-web-api