Dry-run validation of a config object against the engine’s type-specific rules. The config is not saved — use this to check for errors before calling Update Engine Config.
Always returns 200 OK with a valid boolean and an errors
array. If valid is true, the errors array is empty.
API key with environment prefix. Use nx_test_... for sandbox and
nx_live_... for production. Obtain keys at
platform.usenexio.com/settings/api-keys.
Engine identifier slug (e.g. default).
Full replacement config. Must conform to the engine's type-specific schema. Use the validate endpoint to check before saving.