Create or update transformation code
curl --request POST \ --url https://app.indexing.co/dw/transformations/{name} \ --header 'Content-Type: application/json' \ --header 'X-API-KEY: <api-key>' \ --data '{ "code": "function transform(block) { ... }" }'
{ "message": "<string>" }
"function transform(block) { ... }"