Update transaction item statuses

PUT https://api.revclic.com/merchants/{id}/transactions/{transaction_id}

Update the status of items in an existing transaction for a specific merchant.

Authentication Required: User must be authenticated and have the 'merchant' feature flag.

Authorization: Merchant users can only update transactions for their own merchant account.

Important: Only the status field of basket items can be updated. You cannot add, remove, or modify other item properties (ean, name, price, quantity, commission_rate). The basket_content array must contain the same number of items as the original transaction. Commission is only calculated for items with status "accepted".