External services generated Dynamic Apex has _set attribute which is rejected by target endpoint

Question

Trying to use External Services to process a list of Objects.

YAML JSON attribute looks like below,

            "FirstName": {
                "type": "string",
                "description": "FirstName is the firstname to use for creating the account. @gotag: valid:\"required\""
            },

Generated corresponding Apex Wrapper class (Dynamic Apex) has below,

// [PROPERTY] FirstName
// FirstName is the firstname to use for creating the account. @gotag: valid:"required"
@AuraEnabled
global String FirstName {get; set{ this.FirstName = value; this.FirstName_set = true; }}
global Boolean FirstName_set {get; set;}

JSON body sent by flow has below,

{ "FirstName_set" : true, "FirstName" : "Test" }

Endpoint is throwing error as it does not expect 'FirstName_set' in the request body. I wonder why Salesforce is adding this attribute? Is there a way to remove it?

Thanks!

Answer 1

Send it to your own Apex REST service that acts as a middleware to remove it or write your own Apex wrapper that removes it