Core concepts
Understanding projects, input types, tasks, results, and balance prevents most workflow mistakes.

| Concept | Meaning |
|---|---|
| Check project | A specific checking capability with its own input type, price, and quantity range. |
| Input type | Phone number, email, or username; the file must match the project. |
| Task | One submitted check with a unique task ID and lifecycle status. |
| Result | The result file and preview data produced by a successful or partially successful task. |
| Balance | Available funds formed by top-ups, gifts, consumption, and refunds. |