Hello @naux !
Yes, I managed to solve the problem! What I needed to do was wrap this body in a new data object, like this:
curl --location 'https://api.appstoreconnect.apple.com/v1/customerReviewResponses' \
--header 'Authorization: {{MY_BEARER_TOKEN}}' \
--header 'Content-Type: application/json' \
--data '{
"data": {
"attributes": {
"responseBody": "{{MY_RESPONSE}}"
},
"relationships": {
"review": {
"data": {
"id": "{{REVIEW_ID}}",
"type": "customerReviews"
}
}
},
"type": "customerReviewResponses"
}
}'