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I am requesting external application from SF on daily basis to get records and sync. I have 5-10 custom objects in our environment. I have to make API calls individually to get all those records and update them on SF. So, I am using scheduler to schedule a job and calling batch controller. I am looping through object names and batching them in sequence.

Controller:

global class ScheduleGetAllRecords implements schedulable{
global void execute(SchedulableContext sc) 
{
    objectList.add('customers');
    objectList.add('invoices');
    objectList.add('orders');
    objectList.add('payments');
    Datetime sysTime = Date.today().addDays(-1);

    //customSetting where we are saving credentials
    String username = customSetting.name;
    String password = customSetting.password__c;
    Blob headerValue = Blob.valueOf(username + ':' + password);
    String authorizationHeader = 'Basic ' + EncodingUtil.base64Encode(headerValue);

    for(String s:objectList){
        system.debug('sObject name in Loop:: '+s);
        String url = customSetting.Endpoint_URL__c;
        url+='/rest/'+s+'?format=xml&createStartTime='+sysTime.format('YYYYMMddHHmm')+
            '&updateStartTime='+sysTime.format('YYYYMMddHHmm');
        BatchGetAllRecordsController getRecs = new BatchGetAllRecordsController(''+s,''+url, ''+authorizationHeader);
        database.executeBatch(getRecs);
    }
}}

BATCH CONTROLLER::

global with sharing class BatchGetAllRecordsController implements Database.Batchable<sObject>, Database.Stateful, Database.AllowsCallouts {
global string s_object;
global List<sObject> sObjectInsertRecords;
global List<sObject> sObjectUpdateRecords;
global String endpointUrl;
global final String authorizationHeader;
global map<String, list<sObject>> resultRecordList;
global BatchGetAllRecordsController(String objName, String endpointUrl, String authorizationHeader){
    this.s_object = objName;
    this.endpointUrl = endpointUrl;
    this.authorizationHeader = authorizationHeader;
}
global Database.QueryLocator start(Database.BatchableContext BC){
    String objectName;
    if(s_object =='customers'){
        objectName = 'Account';
    }
    if(s_object =='orders'){
        objectName = 'Order__c';
    }
    if(s_object =='invoices'){
        objectName = 'Invoice__c';
    }
    if(s_object =='payments'){
        objectName = 'Payment__c';
    }
    String query = 'SELECT id, Name FROM '+objectName;

    return Database.getQueryLocator(query);
}    
global void execute(Database.BatchableContext BC, List<sObject> batch){
    system.debug('object Name:: '+s_object);
    boolean doesRecordsExists = true;
    Http h = new Http();
    HttpResponse resXml = new HttpResponse();
    HttpRequest req = new HttpRequest();
    req.setHeader('Authorization', authorizationHeader);
    req.setHeader('Content-Type', 'text/xml');
    req.setMethod('GET');
    req.setEndpoint(endpointUrl); 
    resXml= h.send(req);
    String responseBody = resXml.getBody();
    system.debug('reponse body:: '+responseBody);
    FutureGetAllRecords recController = new FutureGetAllRecords();
    resultRecordList = recController.parseXml(s_object, responseBody);
    for (String keyValues : resultRecordList.keySet()){
        List<sObject> recordToInsert = new List<sObject>();
        List<sObject> recordToUpdate = new List<sObject>();
        List<sObject> recordLineItemList = new List<sObject>();
        if(keyValues=='recordUpdateList'){
            recordToUpdate = resultRecordList.get(keyValues);
            system.debug('received recordUpdateList list size:: '+recordToUpdate.size());
        }
        if(keyValues=='recordInsertList'){
            recordToInsert = resultRecordList.get(keyValues);
            system.debug('received recordInsertList size:: '+recordToInsert.size());
        }
    }
    insert sObjectInsertRecords;
    update sObjectUpdateRecords;
}
global void finish(Database.BatchableContext BC){

}}

FutureGetAllRecords controller is just parsing XML and returning a MAP which has different lists. I need to update or Insert them accordingly. But I am unable to get orders and payments. Process is stopping after invoices. There are no queue list pending too. Where am I doing wrong. Please advice. Thank you.

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