Bulk creative work becomes predictable when every row is treated as a separate validated result. One missing image should not hide the successful outputs around it.
Start from the published contract
Retrieve the versioned template inputs and map the CSV columns or JSON fields to those names before submitting the batch.
Validate before compute
Catch missing required values, invalid colors and unknown media references before a row consumes render capacity.
Observe rows, not only the batch
Use the batch summary for progress and row status for delivery, human-readable errors and focused retries.