Add MyECLPay invoices system

app/core/myeclpay/coredata_myeclpay.py

@@ -0,0 +1,9 @@
+from uuid import UUID
+
+from app.types.core_data import BaseCoreData
+
+
+class MyECLPayBankAccountHolder(BaseCoreData):
+    """Bank account holder information for MyECLPay."""
+
+    holder_structure_id: UUID