## §OIP SYSTEM ARTICLE — SHA256 (1 operations)
A generated article for one OIP shelf. It lists every operation in this API/CLI/MCP/device/model/core subsystem, links each leaf article, and gives the ledger path for proof.

### Read Order
- scan operations
- open a leaf doc
- run via run_now or POST /api/dispatch
- open receipt
- repair/replay if needed

### Operations
- **SHA256_LOWER** — SHA-256 hex of lowercased trimmed input
  when: hash em/ph/external_id for Meta CAPI or any PII hashing
  args: $1
  doc: https://miscsubjects.com/api/dispatch?key=SHA256_LOWER&format=markdown
  run: https://miscsubjects.com/api/dispatch?invoke=SHA256_LOWER&body=%3Carg1%3E&share=<TOKEN>
  history: https://miscsubjects.com/api/invocations?object_id=SHA256_LOWER

### Troubleshooting
- If a row's example has placeholders, replace only the placeholder values and preserve separators.
- If a call fails, open its receipt and repair it with POST /api/dispatch {key, body, repairs:'inv_ID'}.
- If token scope denies this system, ask the owner for a row:/rows:/pfx: token scoped to the exact operation set.

Back to the tree: https://miscsubjects.com/api/dispatch?map=1&format=markdown