Как передать параметры @httppost в интеграцию apex?

Question

Я пытаюсь объединить две организации Salesforce. Как передать параметры httppost метода из другой организации salesforce в код апекса, пожалуйста, найдите приведенные ниже коды, которые он пробовал, но я получаю статус 400 плохих запросов. Метод GET работает нормально, Как передать параметр имени из другой организации?

Сопоставленный класс источника org:

  // The @RestResource annotation is used at the class level and enables you to expose an Apex class as a REST resource.
        // more details -> https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_annotation_rest_resource.htm
        @RestResource(urlMapping='/v1/getContact/*')
        global with sharing class getContact 
        {
            @Httpget
            global static list<contact> fetchContact()
            {
                RestRequest req = RestContext.request;
                RestResponse res = Restcontext.response;
                //Get input conId from the request string.
                Id conId = req.requestURI.substring(req.requestURI.lastIndexOf('/')+1);
                // Get the list of contacts by passing input conId. In this case, it will return only 1 record.
                list<contact> lstcontact =[Select id,Name,Email,MobilePhone from contact where id=:conId ];
                // return back the contact list to calling system.
                return lstcontact ;
            }
            @HttpPost
            global static string createNewContact(String name)
            {
                Contact c=new Contact();
                c.LastName=name;
                insert c;
                return 'contact sucessfully created';
            }

            @HttpDelete
            global static string deleteContact()
            {
                RestRequest req=RestContext.request;
                String ids=req.params.get('Id');
                List<Contact> c=[select id from contact where id=:ids];
                delete c;
                return 'contact deleted successfully';
            }

            @Httpput
            global static string putContact(String ids,String Name)
            {
                Contact c=[select id from contact where id=:ids];
                c.LastName=Name;
                update c;
                return 'contact updated successfully';
            }
        }

Контроллер класса назначения org:

public class apexintegration {

public string getContactid {get;set;}

public List<contact> outputlst {get;set;}

public List<Contact> contact {get; set;}

public string JSONResponse {get;set;}

private final string clientid='xxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
private final string clientsecret='xxxxxxxxxxxxxxxxxxxxxxxxxxxx';
private final string username='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
private final string password='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';

public class deserializeResponse
{
    public string id;
    public string access_token;
}

public string returnAccesstoken(apexintegration a)
{
    String reqBody='grant_type=password&client_id='+clientid+'&client_secret='+clientsecret+'&username='+username+'&password='+password;
    Http h=new http();
    HttpRequest req=new HttpRequest();
    req.setBody(reqBody);
    req.setMethod('POST');
    req.setEndpoint('https://login.salesforce.com/services/oauth2/token');
    HttpResponse res=h.send(req);
    deserializeResponse resp1=(deserializeResponse)JSON.deserialize(res.getBody(), deserializeResponse.class);
    return resp1.access_token;
}

public void getContact()
{
    apexintegration a=new apexintegration();

    String accesstoken;
    accesstoken=a.returnAccesstoken(a);
    if(accesstoken!=null)
    {
        String endPoint='https://curious-wolf-71m22l-dev-ed.my.salesforce.com/services/apexrest/v1/getContact/';
        Http h2 = new Http();
        HttpRequest req1 = new HttpRequest();
        req1.setHeader('Authorization','Bearer ' + accessToken);
        req1.setHeader('Content-Type','application/json');
        req1.setHeader('accept','application/json');
        req1.setMethod('GET');
        req1.setEndpoint(endPoint);
        HttpResponse res1 = h2.send(req1);
        // store raw JSON response
        JSONResponse = res1.getBody().unescapeCsv().remove('\\');
        contact = (List<Contact>) JSON.deserialize(JSONResponse, List<Contact>.class);

    }
    outputlst= contact;
}

public void createContact()
{
    apexintegration a=new apexintegration();

    String accesstoken;
    accesstoken=a.returnAccesstoken(a);
    if(accesstoken!=null)
    {
        String endPoint='https://curious-wolf-71m22l-dev-ed.my.salesforce.com/services/apexrest/v1/getContact/';
        String body= 'name=saivinaymnprm';
        Http h2 = new Http();
        HttpRequest req1 = new HttpRequest();
        req1.setHeader('Authorization','Bearer ' + accessToken);
        req1.setHeader('Content-Type','application/json');
        req1.setHeader('accept','application/json');
        req1.setMethod('POST');
        req1.setBody(body);
        req1.setEndpoint(endPoint);
        HttpResponse res1 = h2.send(req1);
        JSONResponse = res1.getBody().unescapeCsv().remove('\\');
        String s=(String)JSON.deserialize(JSONResponse, String.class);
        System.debug(s);
}
}

}