Solved : I ended up using python which worked just fine

Ok, so, after a bit of back and forth, here's where I stand : curl --location 'https://api.appstoreconnect.apple.com/v1/analyticsReportRequests' \ --header 'Content-Type: application/json' \ --header 'Authorization: Bearer [my_token]' \ --data '{ "type": "analyticsReportRequests", "attributes": { "accessType": "ONGOING" }, "relationships": { "app" : { "data" : { "type" : "apps", "id" : "[my_appid]" } } } }' I have changed up my request such that it now looks like this, and I've got a new issue : { "errors": [ { "id": "[id]", "status": "422", "code": "ENTITY_UNPROCESSABLE", "title": "The request entity is not a valid request document object", "detail": "Unexpected or invalid value at 'type'.", "meta": { "position": { "row": 2, "column": 22 } } } ] } Doesn't really feel like I've made any progress, but I'm now getting a 422 error response, and I really don't see any way out of this. Any help at all would be appreciated.