Small Powershell Script for MailChimp

I need to send a trigger on MailChimp to send an email to someone when criteria ismet from my database. I can handle the querying of the database and looping. I just do not have any experience with RESTFUL APIs and posting the ID to the endpoint Trigger: A subscriber's email ID is posted to the endpoint [login to view URL] I have managed to cut and paste this from various sources $id = "463453122973a5e9ea60ddf34594c246dcd" $user = "anythingGoesHere" $apiKey = "apikeyhere" $pair = "${user}:${apiKey}" $bytes = [[login to view URL]]::[login to view URL]($pair) $base64 = [[login to view URL]]::ToBase64String($bytes) $basicAuthValue = "Basic $base64" $Headers = @{ Authorization = $basicAuthValue } $baseUri = "[login to view URL]" $body = @{Id = $id} Invoke-RestMethod -Uri $baseUri -Method Post -Headers $Headers -Body $body This is the error: Invoke-RestMethod : {"type":"[login to view URL]","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","instance":"ebb27e6b-4648-4e54-9b54-b900d2c3c901","errors":[{"field":"","message":"Schema describes object, NULL found instead"}]} At C:\Data\Powershell\[login to view URL] char:1 + Invoke-RestMethod -Uri $baseUri -Method Post -Headers $Headers -Body ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: ([login to view URL]:HttpWebRequest) [Invoke-RestMethod], WebException + FullyQualifiedErrorId : WebCmdletWebResponseException,[login to view URL] I am ready to pay someone that knows what they are doing because I am banging my head against a wall.