Invoke-RestMethod -Headers @{'Authorization'= ('Basic ' + [convert]::ToBase64String(('user:pwd').ToCharArray()))} `
                  -Uri 'http://server:8080/ae/api/v1/1234/executions' `
                  -Method POST `
                  -Body (ConvertTo-Json -Depth 5 -Compress @{ object_name = "OBJECT_TO_START" }) `
                  -ContentType 'application/json'

# One-liner:
#Invoke-RestMethod -Headers @{'Authorization'= ('Basic' + [convert]::ToBase64String(('<user>:<pw>').ToCharArray()))} -Uri 'http://vviesup06:8088/ae/api/v1/22/executions' -Method 'POST' -Body (ConvertTo-Json -Depth 5 -Compress @{ "object_name" = "SCRI.STARTED.VIA.REST_API" }) -ContentType 'application/json'