- Add subtract_fee and replace_by_fee flags to PaymentDetails. replace_by_fee is commented out as it's only available in version 2 of the message

bip-0075/paymentrequest.proto

@@ -23,6 +23,8 @@ message PaymentDetails {
         optional string memo = 5;               // Human-readable description of request for the customer
         optional string payment_url = 6;        // URL to send Payment and get PaymentACK
         optional bytes  merchant_data = 7;      // Arbitrary data to include in the Payment message
+        optional bool subtract_fee = 1000;      // Allow SubtractableFee
+        //optional bool replace_by_fee = 1001;    // Force RBF true or false (version: 2)
 }
 message PaymentRequest {
         optional uint32 payment_details_version = 1 [default = 1];