feat: billing guest access

schemas/billing.py

@@ -0,0 +1,24 @@
+import datetime
+from typing import Optional
+
+from schemas.base import BaseSchema, OkMessageSchema
+
+
+class DealBillRequestSchema(BaseSchema):
+    deal_id: int
+    created_at: datetime.datetime
+    paid: bool
+    pdf_url: Optional[str]
+    invoice_number: Optional[str]
+
+
+class CreateDealBillRequest(BaseSchema):
+    deal_id: int
+
+
+class CreateDealBillResponse(OkMessageSchema):
+    pass
+
+
+class GetDealBillById(BaseSchema):
+    deal_bill: DealBillRequestSchema