A video generation API does more than accept a payload and return an MP4. Production workflows need durable source projects, separately managed media, validation before expensive work, asynchronous status and a reliable connection between each request and its result. This guide explains the architecture without exposing internal rendering implementation.
Choose between projects and templates
Use a project when the composition itself changes. Use a template when the composition is already approved and only known inputs change. Both should remain inspectable in the visual editor.
For one-off backend rendering, create or update the project source and submit a render. For recurring products, campaigns or customer outputs, publish a versioned template and fill its typed inputs.
- Projects preserve the complete editable source
- Templates expose a deliberate public contract
- Template versions keep existing integrations stable
- Renders reference the source instead of duplicating it
Move large media into scoped storage first.
›Save a project or fill a versioned template.
›Resolve missing fields and unsupported media before rendering.
›Start an asynchronous operation with an idempotency key.
›Receive a signed webhook and store the result URL.
| Resource | Responsibility | Common mistake |
|---|---|---|
| Media | Durable uploads and readable metadata | Embedding large base64 files in every request |
| Project | Editable composition and versions | Treating render input as disposable text |
| Template | Typed repeatable inputs | Exposing coordinates and internal layer IDs |
| Render | Format, status and output | Keeping the HTTP request open for the full job |
| Webhook | Signed completion and failure events | Polling every operation without backoff |
Design for retries and partial failure
Networks fail after a server accepts work. Send an idempotency key with create and render operations so the same retry resolves to the original operation instead of producing a duplicate charge.
Bulk jobs should isolate rows. One missing product image must not discard 499 valid outputs. Return field-specific validation messages and let the caller retry only failed rows.
- Persist your own business identifier with every operation
- Verify webhook signatures against the raw request body
- Return a success response only after the event is durably accepted
- Reconcile unresolved operations with bounded polling
Keep the integration contract smaller than the project
The editable project may contain hundreds of layers, keyframes and media references. An application should not need to understand all of them to create a valid variation. Publish a template contract with stable, meaningful inputs and keep layout implementation details behind it.
Version that contract when a required field changes or when an existing field receives a different meaning. Additive optional fields are easier to roll out, but they still need defaults. Store the template version beside every render so support can reproduce an output after the source evolves.
- Use business names such as productImage and offerText
- Return field paths and accepted values in validation errors
- Keep a default output for every published template version
- Never silently reinterpret an existing input
Plan observability before volume
Every operation should be traceable from the caller's identifier to the project or template version, render status and delivered artifact. Record timestamps for accepted, started, completed and failed states. This makes queue delays, invalid inputs and downstream delivery problems distinguishable.
Monitor outcomes rather than only HTTP success. Useful measures include validation failure rate, completion time by output profile, webhook delivery attempts and the proportion of results that users regenerate. A rising regeneration rate can signal a creative or input-quality problem even when every render is technically successful.