data_mapping_ex.bal

import ballerina/http;
import ballerina/log;

// Data is formatted as: key1=val1;key2=val2
type Person record {|
    string name = "";
    int age = 0;
|};

listener http:Listener endpoint = new (3000);

@http:ServiceConfig {
    basePath: "/api"
}
service Logger on endpoint {
    
    @http:ResourceConfig{
        path: "/logger",
        methods: ["POST"]
    }
    resource function GetTextPayload(http:Caller caller, http:Request req) {
        var payload = req.getTextPayload();       

        if (payload is string) {
            Person|error p = toRecord(payload);

            if (p is Person) {
                // Now you can access the fields as p.name, p.age etc.
                string name = p.name;
                int age = p.age;

                var result = caller->respond("Payload received");
                return;
            } else {
                var result = caller->respond(get400Response(p.reason()));
                return;
            }
        } else {
            var result = caller->respond(get400Response(payload.reason()));
        }
    }
}

function toRecord(string data) returns Person|error {
    Person p = {};
    string[] fields = data.split(";");
    
    foreach var field in fields {
        string[] keyVal = field.split("=");
        
        match keyVal[0] {
            "name" => p.name = keyVal[1];
            "age"  => p.age = check int.convert(keyVal[1]);
            var invalidField => {
                error e = error("Invalid field: " + invalidField);
                return e;
            }
        }
    }

    return p;
}

function get400Response(string msg) returns http:Response {
    http:Response err400 = new;
    err400.statusCode = 400;
    err400.setPayload(untaint msg);
    return err400;
}

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Thanks for your help @pubudu91
You are awesome