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				@@ -1,6 +1,10 @@ 
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				 import os 
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				+ 
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				 import requests 
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				+from extensions.ext_database import db 
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				+from models.account import TenantAccountJoin 
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				+ 
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				 class BillingService: 
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				     base_url = os.environ.get('BILLING_API_URL', 'BILLING_API_URL') 
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				@@ -55,3 +59,15 @@ class BillingService: 
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				         response = requests.request(method, url, json=json, params=params, headers=headers) 
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				         return response.json() 
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				+ 
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				+    @staticmethod 
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				+    def is_tenant_owner(current_user): 
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				+        tenant_id = current_user.current_tenant_id 
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				+ 
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				+        join = db.session.query(TenantAccountJoin).filter( 
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				+            TenantAccountJoin.tenant_id == tenant_id, 
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				+            TenantAccountJoin.account_id == current_user.id 
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				+        ).first() 
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				+ 
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				+        if join.role != 'owner': 
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				+            raise ValueError('Only tenant owner can perform this action') 
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