Custom API Connector Trouble

I'm trying to hit a transport company's API to integrate some tracking details into our office tools. I'm getting a frustrating 'ResponseSwaggerSchemaValidationFailure' on the custom connector (it tests fine). Error details: 'The API operation 'GetTracking' requires the property 'body' to be of type 'Object' but is of type 'String'.'

I've done a bit of googling on this, and it looks like flow for some reason just isn't interpreting the response as valid JSON.

I think it's alright though.... This is the response I'm getting to my test lookup ...

{
 "Status": {
 "Code": "OK",
 "Description": "Successful",
 "Count": 1
 },
 "Detail": {
 "Data": {
 "TrackingID": "xxxxx",
 "DateEntered": "07/10/20",
 "ConNo": "205611",
 "CustRef": "676139",
 "Lifts": "1",
 "Weight": "1000.00 Kg",
 "Status": "JOB COMPLETE",
 "Barcodes": "B001727A01",
 "ColDepot": "85 Palletways Fulfilment",
 "DelDepot": "177 Cross Country Carriers Limited",
 "Notes": [
 {
 "NoteType": "IMAGE SCANNED",
 "Barcode": "",
 "Comments": "20201009120157_040_3paperwork.jpg",
 "Date": "09/10/20",
 "Time": "12:02"
 },
 {
 "NoteType": "IMAGE SCANNED",
 "Barcode": "",
 "Comments": "20201009120213_041_sos_pod.tif",
 "Date": "09/10/20",
 "Time": "12:02"
 },
 {
 "NoteType": "CLEAN POD",
 "Barcode": "",
 "Comments": "karen on 09/10/20 at 11:55",
 "Date": "09/10/20",
 "Time": "12:02"
 },
 {
 "NoteType": "SCANNED",
 "Barcode": "B001727A01",
 "Comments": "Scanned onto vehicle MX64LJU at depot 177 C&D MICK",
 "Date": "09/10/20",
 "Time": "08:45"
 },
 {
 "NoteType": "SCANNED IN BAY",
 "Barcode": "B001727A01",
 "Comments": "Baychecked at depot 177\nBaycheck note added in the Palletways Portal by D177-1-User",
 "Date": "09/10/20",
 "Time": "07:01"
 },
 {
 "NoteType": "SCANNED",
 "Barcode": "B001727A01",
 "Comments": "Scanned out of hub to 177 on ay66lpf",
 "Date": "09/10/20",
 "Time": "03:20"
 },
 {
 "NoteType": "SCANNED",
 "Barcode": "B001727A01",
 "Comments": "Scanned out of hub to 177 on AY66LPF",
 "Date": "09/10/20",
 "Time": "03:20"
 },
 {
 "NoteType": "Archway Scan",
 "Barcode": "B001727A01",
 "Comments": "ARCHWAY SCAN - Fradley Ka SHED Exit on vehicle AY66LPF [Depot 177]",
 "Date": "09/10/20",
 "Time": "03:20"
 },
 {
 "NoteType": "Archway Scan",
 "Barcode": "B001727A01",
 "Comments": "ARCHWAY SCAN - Fradley Ka SHED Entry on vehicle YG19BMO [Depot 50]",
 "Date": "08/10/20",
 "Time": "15:18"
 },
 {
 "NoteType": "SCANNED",
 "Barcode": "B001727A01",
 "Comments": "Scanned on to vehicle NEXTGEN at depot 85 TRUNK RUN ",
 "Date": "07/10/20",
 "Time": "13:21"
 }
 ],
 "PODurl": "http://track.palletways.com/jmstest.php?path=/var/www4001_sos_pod.tif",
 "tracking_url": "http://track.palletways.com/cgi-bin/wstra454001"
 }
 }
}

Am I missing something obvious?

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