feat(orders): integrate Pally payment and order management

schemas/invoices.py

@@ -0,0 +1,15 @@
+from enum import StrEnum
+
+from pydantic import BaseModel
+
+
+class InvoiceStatus(StrEnum):
+    EXPIRED = "expired"
+    ACTIVE = "active"
+    PAID = "paid"
+
+
+class InvoiceResponse(BaseModel):
+    success: bool
+    amount: float
+    payment_link: str