> ## Documentation Index
> Fetch the complete documentation index at: https://docs.echozero.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Full lifecycle in Python

> Entry, partial sell, and cancel with inbound webhook signing.

```python theme={null}
import os, time, json, hmac, hashlib, requests

AGENT_ID = os.environ["AGENT_ID"]
SECRET = os.environ["EZW_SECRET"]
BASE = "https://mcp.echozero.app/api/public/agent-signals"

STRUCTURED_KEYS = {
    "action", "amount", "chain", "changes", "clientTimestamp", "confidence",
    "context", "currentPnlPct", "entryPrice", "entryZone", "eventType",
    "exitPrice", "exitReason", "expiresAt", "ideaId", "instrument",
    "leverageX", "metadata", "orderType", "pnlPct", "positionRef",
    "reasoning", "relatedTradeId", "riskMgmt", "sellSizePct", "side",
    "symbol", "tokenAddress", "tradeType", "triggers", "urgency", "version",
}

def canonical_json(body: dict) -> str:
    out = {}
    if "text" in body:
        out["text"] = body["text"]
    if body.get("idempotencyKey", "").strip():
        out["idempotencyKey"] = body["idempotencyKey"].strip()
    for k in sorted(STRUCTURED_KEYS):
        if k in body:
            out[k] = body[k]
    return json.dumps(out, separators=(",", ":"), sort_keys=True)

def sign_and_post(body: dict):
    ts = str(int(time.time()))
    canon = canonical_json(body)
    sig = hmac.new(SECRET.encode(), f"{ts}.{canon}".encode(), hashlib.sha256).hexdigest()
    return requests.post(
        f"{BASE}/{AGENT_ID}",
        headers={
            "Content-Type": "application/json",
            "X-EZ-Timestamp": ts,
            "X-EZ-Signature": sig,
        },
        json=body,
        timeout=30,
    ).json()

# 1. Entry
entry = sign_and_post({
    "eventType": "buy",
    "idempotencyKey": "py-demo-entry-001",
    "chain": "solana",
    "instrument": {"tokenAddress": "So11111111111111111111111111111111111111112"},
    "symbol": "SOL",
    "amount": 200,
    "reasoning": "Python lifecycle demo entry.",
})
print("entry", entry)

# 2. Partial sell
partial = sign_and_post({
    "eventType": "partial_sell",
    "idempotencyKey": "py-demo-partial-001",
    "positionRef": "py-demo-entry-001",
    "sellSizePct": 50,
    "reasoning": "Scale out half.",
})
print("partial", partial)
```

When published, use `echozero.sign_inbound_webhook` from the [SDK](/guides/sdk) instead of inline canonicalization.