diff --git a/.template.env b/.template.env
index 31b147b..1c6a333 100644
--- a/.template.env
+++ b/.template.env
@@ -56,3 +56,10 @@ S3_SECRET_ACCESS_KEY=
 #   python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
 # À CONSERVER HORS DU SERVEUR : sans elle, les sauvegardes sont irrécupérables.
 BACKUP_ENCRYPTION_KEY=
+
+# Frisbii — gestion des abonnements (https://docs.frisbii.com)
+FRISBII_API_KEY=                 # clé PRIVÉE (priv_...), serveur uniquement
+FRISBII_API_BASE_URL=            # base de l'API Frisbii (déf. https://api.reepay.com, à confirmer)
+FRISBII_PLAN_SIMPLE=             # handle du plan "abonnement simple" (20 € HT/mois)
+FRISBII_PLAN_SOUTIEN=            # handle du plan "abonnement de soutien" (50 € HT/mois)
+FRISBII_WEBHOOK_SECRET=          # secret de signature des webhooks
diff --git a/src/app.py b/src/app.py
index a2b5f72..b3bc72f 100644
--- a/src/app.py
+++ b/src/app.py
@@ -90,6 +90,10 @@ from src.api import init_api  # noqa: E402  # inline: src.db.conn must be ready
 
 init_api(app.server)
 
+from src.subscriptions.setup import init_subscriptions  # noqa: E402
+
+init_subscriptions(app.server)
+
 
 # robots.txt
 @app.server.route("/robots.txt")
diff --git a/src/subscriptions/routes.py b/src/subscriptions/routes.py
new file mode 100644
index 0000000..df66a0b
--- /dev/null
+++ b/src/subscriptions/routes.py
@@ -0,0 +1,78 @@
+import os
+
+from flask import Blueprint, redirect, request
+from flask_login import current_user, login_required
+
+from src.subscriptions import client, db, plans, webhooks
+from src.utils import logger
+
+subscriptions_bp = Blueprint("subscriptions", __name__)
+
+
+def _customer_handle(user_id: int) -> str:
+    return f"decpinfo-{user_id}"
+
+
+@subscriptions_bp.route("/subscriptions/subscribe", methods=["POST"])
+@login_required
+def subscribe():
+    plan_key = request.form.get("plan") or ""
+    handle = plans.resolve_handle(plan_key)
+    if handle is None:
+        return "Plan inconnu", 400
+
+    base = os.getenv("APP_BASE_URL", "")
+    cust = _customer_handle(current_user.id)
+    try:
+        client.get_or_create_customer(cust, current_user.email)
+        db.create_pending(current_user.id, cust, plan_key)
+        # Anti-abus : pas de nouvel essai si l'utilisateur en a déjà consommé un.
+        no_trial = db.has_used_trial(current_user.id)
+        url = client.create_subscription_session(
+            handle,
+            cust,
+            f"{base}/compte/abonnement?paiement=succes",
+            f"{base}/compte/abonnement?paiement=annule",
+            no_trial=no_trial,
+        )
+    except client.FrisbiiError:
+        logger.exception("Échec de création de session d'abonnement Frisbii")
+        return redirect("/compte/abonnement?error=frisbii")
+    return redirect(url, code=303)
+
+
+@subscriptions_bp.route("/subscriptions/cancel", methods=["POST"])
+@login_required
+def cancel():
+    row = db.get_by_user(current_user.id)
+    if row is None or not row["frisbii_subscription_handle"]:
+        return "Aucun abonnement à résilier", 400
+    try:
+        sub = client.cancel_subscription(row["frisbii_subscription_handle"])
+    except client.FrisbiiError:
+        logger.exception("Échec de résiliation Frisbii")
+        return redirect("/compte/abonnement?error=frisbii")
+    db.set_cancelled(current_user.id, sub.get("expires"))
+    return redirect("/compte/abonnement?resiliation=ok")
+
+
+@subscriptions_bp.route("/frisbii/webhook", methods=["POST"])
+def webhook():
+    payload = request.get_json(silent=True) or {}
+    if not webhooks.verify_signature(payload, os.getenv("FRISBII_WEBHOOK_SECRET", "")):
+        return "", 403
+
+    customer = payload.get("customer")
+    sub_handle = payload.get("subscription")
+    if not customer or db.get_by_customer(customer) is None:
+        return "", 200  # rien à rapprocher
+    try:
+        sub = client.get_subscription(sub_handle) if sub_handle else None
+    except client.FrisbiiError:
+        logger.exception("Webhook : lecture de l'abonnement Frisbii impossible")
+        return "", 502  # Frisbii réessaiera
+    if sub is None:
+        return "", 200
+    status, current_period_end = webhooks.map_subscription(sub)
+    db.update_from_webhook(customer, sub_handle, status, current_period_end)
+    return "", 200
diff --git a/src/subscriptions/setup.py b/src/subscriptions/setup.py
new file mode 100644
index 0000000..2f77e22
--- /dev/null
+++ b/src/subscriptions/setup.py
@@ -0,0 +1,35 @@
+import os
+
+from flask import Flask
+
+from src.subscriptions import db
+from src.utils import logger
+
+_REQUIRED_ENV = (
+    "FRISBII_API_KEY",
+    "FRISBII_WEBHOOK_SECRET",
+    "FRISBII_PLAN_SIMPLE",
+    "FRISBII_PLAN_SOUTIEN",
+)
+
+
+def init_subscriptions(app: Flask) -> None:
+    db.init_schema()
+
+    from src.subscriptions.routes import subscriptions_bp, webhook
+
+    app.register_blueprint(subscriptions_bp)
+
+    # Le webhook reçoit des POST externes : pas de jeton CSRF possible.
+    from src.auth.setup import _csrf as _auth_csrf
+
+    if _auth_csrf is not None:
+        _auth_csrf.exempt(webhook)  # exempte la seule vue webhook
+
+    missing = [name for name in _REQUIRED_ENV if not os.getenv(name)]
+    if missing:
+        logger.warning(
+            "Variables Frisbii manquantes (%s) : les abonnements échoueront. "
+            "Définissez-les dans .env (voir .template.env).",
+            ", ".join(missing),
+        )
diff --git a/tests/subscriptions/conftest.py b/tests/subscriptions/conftest.py
index 104c6d8..8b7ed2f 100644
--- a/tests/subscriptions/conftest.py
+++ b/tests/subscriptions/conftest.py
@@ -45,3 +45,36 @@ def fake_httpx(monkeypatch):
     monkeypatch.setenv("FRISBII_API_BASE_URL", "https://api.test")
     monkeypatch.setattr(client.httpx, "request", _fake_request)
     return {"calls": calls, "queue": queue, "Response": FakeResponse}
+
+
+@pytest.fixture
+def sub_app(users_db_path, monkeypatch):
+    from flask import Flask
+
+    from src.auth.setup import init_auth
+    from src.subscriptions.setup import init_subscriptions
+
+    monkeypatch.setenv("SECRET_KEY", "test-secret-key")
+    monkeypatch.setenv("APP_BASE_URL", "http://localhost:8050")
+    monkeypatch.setenv("FRISBII_PLAN_SIMPLE", "plan_simple")
+    monkeypatch.setenv("FRISBII_PLAN_SOUTIEN", "plan_soutien")
+    monkeypatch.setenv("FRISBII_WEBHOOK_SECRET", "s3cr3t")
+    app = Flask(__name__)
+    app.config["WTF_CSRF_ENABLED"] = False
+    init_auth(app)
+    init_subscriptions(app)
+    return app
+
+
+@pytest.fixture
+def logged_in_client(sub_app):
+    from src.auth import db as auth_db
+
+    auth_db.init_schema()
+    uid = auth_db.create_user("sub@ex.fr", "hash")
+    auth_db.set_email_verified(uid)
+    client = sub_app.test_client()
+    with client.session_transaction() as sess:
+        sess["_user_id"] = str(uid)
+        sess["_fresh"] = True
+    return client, uid
diff --git a/tests/subscriptions/test_routes.py b/tests/subscriptions/test_routes.py
new file mode 100644
index 0000000..855dac0
--- /dev/null
+++ b/tests/subscriptions/test_routes.py
@@ -0,0 +1,126 @@
+import hashlib
+import hmac
+
+from src.subscriptions import client as frisbii_client
+from src.subscriptions import db
+
+
+def _sign(secret, timestamp, event_id):
+    return hmac.new(
+        secret.encode(), (timestamp + event_id).encode(), hashlib.sha256
+    ).hexdigest()
+
+
+def test_subscribe_redirects_to_hosted_url(logged_in_client, monkeypatch):
+    client, uid = logged_in_client
+    monkeypatch.setattr(
+        frisbii_client, "get_or_create_customer", lambda h, e: {"handle": h}
+    )
+    monkeypatch.setattr(
+        frisbii_client,
+        "create_subscription_session",
+        lambda plan, cust, ok, ko, no_trial=False: "https://pay.test/cs_1",
+    )
+    resp = client.post("/subscriptions/subscribe", data={"plan": "simple"})
+    assert resp.status_code == 303
+    assert resp.headers["Location"] == "https://pay.test/cs_1"
+    assert db.get_by_user(uid)["status"] == "pending"
+
+
+def test_subscribe_disables_trial_after_first_use(logged_in_client, monkeypatch):
+    client, uid = logged_in_client
+    # L'utilisateur a déjà consommé un essai par le passé.
+    db.create_pending(uid, "decpinfo-%d" % uid, "simple")
+    db.update_from_webhook(
+        "decpinfo-%d" % uid, "sub_42", "trial", "2099-01-01T00:00:00+00:00"
+    )
+    captured = {}
+    monkeypatch.setattr(
+        frisbii_client, "get_or_create_customer", lambda h, e: {"handle": h}
+    )
+
+    def fake_session(plan, cust, ok, ko, no_trial=False):
+        captured["no_trial"] = no_trial
+        return "https://pay.test/cs_9"
+
+    monkeypatch.setattr(frisbii_client, "create_subscription_session", fake_session)
+    resp = client.post("/subscriptions/subscribe", data={"plan": "soutien"})
+    assert resp.status_code == 303
+    assert captured["no_trial"] is True
+
+
+def test_subscribe_unknown_plan(logged_in_client):
+    client, _ = logged_in_client
+    resp = client.post("/subscriptions/subscribe", data={"plan": "bidon"})
+    assert resp.status_code == 400
+
+
+def test_subscribe_api_error_redirects_with_error(logged_in_client, monkeypatch):
+    client, _ = logged_in_client
+
+    def boom(h, e):
+        raise frisbii_client.FrisbiiError(500, "boom")
+
+    monkeypatch.setattr(frisbii_client, "get_or_create_customer", boom)
+    resp = client.post("/subscriptions/subscribe", data={"plan": "simple"})
+    assert resp.status_code == 302
+    assert "error=frisbii" in resp.headers["Location"]
+
+
+def test_subscribe_requires_login(sub_app):
+    resp = sub_app.test_client().post(
+        "/subscriptions/subscribe", data={"plan": "simple"}
+    )
+    assert resp.status_code in (302, 401)
+
+
+def test_cancel_calls_api_and_marks_cancelled(logged_in_client, monkeypatch):
+    client, uid = logged_in_client
+    db.create_pending(uid, "decpinfo-%d" % uid, "simple")
+    db.update_from_webhook(
+        "decpinfo-%d" % uid, "sub_42", "active", "2099-01-01T00:00:00+00:00"
+    )
+    monkeypatch.setattr(
+        frisbii_client,
+        "cancel_subscription",
+        lambda handle: {"expires": "2099-02-01T00:00:00+00:00"},
+    )
+    resp = client.post("/subscriptions/cancel")
+    assert resp.status_code == 302
+    assert "resiliation=ok" in resp.headers["Location"]
+    row = db.get_by_user(uid)
+    assert row["status"] == "cancelled"
+    assert row["current_period_end"] == "2099-02-01T00:00:00+00:00"
+
+
+def test_webhook_invalid_signature(sub_app):
+    resp = sub_app.test_client().post(
+        "/frisbii/webhook", json={"id": "e", "signature": "x"}
+    )
+    assert resp.status_code == 403
+
+
+def test_webhook_updates_subscription(sub_app, monkeypatch):
+    from src.auth import db as auth_db
+
+    auth_db.init_schema()
+    uid = auth_db.create_user("wh@ex.fr", "hash")
+    db.create_pending(uid, "decpinfo-%d" % uid, "simple")
+    monkeypatch.setattr(
+        frisbii_client,
+        "get_subscription",
+        lambda h: {"state": "active", "next_period_start": "2099-01-01T00:00:00+00:00"},
+    )
+    payload = {
+        "id": "evt_1",
+        "timestamp": "2026-06-25T10:00:00Z",
+        "event_type": "subscription_created",
+        "customer": "decpinfo-%d" % uid,
+        "subscription": "sub_42",
+    }
+    payload["signature"] = _sign("s3cr3t", payload["timestamp"], payload["id"])
+    resp = sub_app.test_client().post("/frisbii/webhook", json=payload)
+    assert resp.status_code == 200
+    row = db.get_by_user(uid)
+    assert row["status"] == "active"
+    assert row["frisbii_subscription_handle"] == "sub_42"