How to push CFS Fields(non-Filetype) for Opportunity? | API

How to push CFS Fields(non-Filetype) for Opportunity? | API

Query: 
>> In Opportunity I am trying to insert fields within a field set. I tried replicating the solution for Leads section as provided in the API Docs page but getting error. 

Solution: 
To do that, please retrieve the schema names using the steps and descriptive screenshots below; 


2) Go to the respective CFS;


3) Post retrieving the CFS Core Schemas, click on Edit to retrieve sub-field schemas;


4) Voila! You should now be having access to the necessary schema names; 


Sample cURL:
cURL Request:
--header 'Content-Type: application/json' \
--data '{
"ProspectOpportunityId": "8194e5da-a7de-4348-bbc3-9275281cea89",
"OpportunityNote": "Update note",
"Fields": [
{
"SchemaName": "mx_Custom_1",
"Value": "test saideeo"
},
{

                "SchemaName": "mx_Custom_42",  
                "DisplayName": "Dates",
                "Fields": [

                    {

                        "SchemaName": "mx_CustomObject_1",

                        "Value": "2024-04-16 15:13:44"

                    }

                ]

  }

]
}'

Please use the above cURL as a reference to build your API body and hope that helps!