gloabl api key issue, credit service issue, credit cost basedon tokens all fixed

backend/igny8_core/business/billing/services/credit_service.py

@@ -82,6 +82,62 @@ class CreditService:
         
         return credits
     
+    @staticmethod
+    def check_credits(account, operation_type, estimated_amount=None):
+        """
+        Check if account has sufficient credits for an operation.
+        For token-based operations, this is an estimate check only.
+        Actual deduction happens after AI call with real token usage.
+        
+        Args:
+            account: Account instance
+            operation_type: Type of operation
+            estimated_amount: Optional estimated amount (for non-token operations)
+        
+        Raises:
+            InsufficientCreditsError: If account doesn't have enough credits
+        """
+        from igny8_core.business.billing.models import CreditCostConfig
+        from igny8_core.business.billing.constants import CREDIT_COSTS
+        
+        # Get operation config
+        config = CreditCostConfig.objects.filter(
+            operation_type=operation_type,
+            is_active=True
+        ).first()
+        
+        if config:
+            # Use minimum credits as estimate for token-based operations
+            required = config.min_credits
+        else:
+            # Fallback to constants
+            required = CREDIT_COSTS.get(operation_type, 1)
+        
+        if account.credits < required:
+            raise InsufficientCreditsError(
+                f"Insufficient credits. Required: {required}, Available: {account.credits}"
+            )
+        return True
+    
+    @staticmethod
+    def check_credits_legacy(account, amount):
+        """
+        Legacy method to check credits for a known amount.
+        Used internally by deduct_credits.
+        
+        Args:
+            account: Account instance
+            amount: Required credits amount
+        
+        Raises:
+            InsufficientCreditsError: If account doesn't have enough credits
+        """
+        if account.credits < amount:
+            raise InsufficientCreditsError(
+                f"Insufficient credits. Required: {amount}, Available: {account.credits}"
+            )
+        return True
+    
     @staticmethod
     def check_credits_for_tokens(account, operation_type, estimated_tokens_input, estimated_tokens_output):
         """