I am getting missing credential error while calling refundtransaction through paypal sdk BasicAmountType refundAmount = new BasicAmountType { value = amount.ToString(CultureInfo.InvariantCulture) }; RefundTransactionReq refundTransactionReq = new RefundTransactionReq { RefundTransactionRequest = new RefundTransactionRequestType { TransactionID = transactionId, Amount = refundAmount, RefundType = RefundType.PARTIAL } }; var service = new PayPalAPIInterfaceServiceService(PayPalConfig.GetConfig(payment)); var response=service.RefundTransaction(refundTransactionReq);
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