diff --git a/foxnouns/app.py b/foxnouns/app.py
index af561a8..ef3fb2e 100644
--- a/foxnouns/app.py
+++ b/foxnouns/app.py
@@ -6,7 +6,7 @@ from . import blueprints
 from .db.aio import async_session
 from .db.util import validate_token
 from .exceptions import ErrorCode, ExpectedError
-from .settings import SECRET_KEY, BASE_DOMAIN
+from .settings import BASE_DOMAIN, SECRET_KEY
 
 app = Quart(__name__, host_matching=True, static_host=BASE_DOMAIN)
 app.secret_key = SECRET_KEY
diff --git a/foxnouns/blueprints/v2/auth/__init__.py b/foxnouns/blueprints/v2/auth/__init__.py
new file mode 100644
index 0000000..8d5c920
--- /dev/null
+++ b/foxnouns/blueprints/v2/auth/__init__.py
@@ -0,0 +1,43 @@
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+from foxnouns.models.user import SelfUserModel
+
+
+class OAuthCallbackRequest(BaseModel):
+    callback_domain: str
+    code: str
+    state: str
+
+
+class BaseCallbackResponse(BaseModel):
+    """The base class for callback responses."""
+
+    has_account: bool
+
+
+class ExistingUserCallbackResponse(BaseCallbackResponse):
+    """The class returned when a user already exists."""
+
+    token: str
+    user: SelfUserModel
+
+
+class NewUserCallbackResponse(BaseCallbackResponse):
+    """The class returned when the user is new and has to create an account."""
+
+    remote_username: str
+    ticket: str
+    require_captcha: bool
+
+
+class DeletedUserCallbackResponse(BaseCallbackResponse):
+    """The class returned when the user has been deleted."""
+
+    token: str
+    user: SelfUserModel
+
+    deleted_at: datetime
+    self_delete: bool
+    delete_reason: str | None = Field(default=None)
diff --git a/foxnouns/blueprints/v2/auth/discord.py b/foxnouns/blueprints/v2/auth/discord.py
new file mode 100644
index 0000000..ff2774f
--- /dev/null
+++ b/foxnouns/blueprints/v2/auth/discord.py
@@ -0,0 +1,15 @@
+from quart import Blueprint
+from quart_schema import validate_request, validate_response
+
+from foxnouns.settings import BASE_DOMAIN
+
+from . import BaseCallbackResponse, OAuthCallbackRequest
+
+bp = Blueprint("discord", __name__)
+
+
+@bp.post("/api/v2/auth/discord/callback", host=BASE_DOMAIN)
+@validate_request(OAuthCallbackRequest)
+@validate_response(BaseCallbackResponse)
+async def discord_callback(data: OAuthCallbackRequest):
+    raise NotImplementedError()