Processing of EXE:
Web Service(“https://qcs-uat.questdiagnostics.com/services/esservice.asmx”) consumed in exe have three web methods which are as,
1) Submit Order
2) Update Order
3) Remove Order

Place an Employer Solutions order requesting drug testing collection services. This method allows for a single donor to be submitted with multiple test events.
This CreateOrder method is the first step in the eOrder process.

There are some conditions on BGC_DTOC_Order__c for creating order to Quest Diagnostics portal,

Partner_Location__r.Integration_Vendor_Name__c should be 'Quest Diagnostics' Ready_For_E_Registration__c should be 'TRUE'
Related_BGC_Order__c should not be null
Drug_Integration_Status__c should be 'Quest Create Order'
Drug_Integration_Status__c should not be 'Quest Validation Error' Related_BGC_Order__r.Order_Status__c should not be 'Cancelled' Related_BGC_Order__r.Order_Status__c
should not be 'Deleted'
Drug_Test_Schedule_Complete__c should be 'FALSE'
Drug_Test_Collection_Complete__c should be 'FALSE'

After satisfying above conditions exe is converting the data into xml format and posted it to web service for processing.
String xmlString = CreateOrder( string Username, string Password, string OrderXML)
Submit Order response: The CreateOrder() Web Method will return an XML string response which describes the outcome of the Web Method request.
Two examples below, Success and Failure.

There are some conditions on BGC_DTOC_Order__c for updating order,
Partner_Location__r.Integration_Vendor_Name__c should be 'Quest Diagnostics'
Ready_For_E_Registration__c should be 'TRUE'
Related_BGC_Order__c should not be null
Drug_Integration_Status__c should be 'Quest Update Order'
Reference_Test_ID__c should not be null
Reference_Test_ID__c should not be blank
Drug_Integration_Status__c should not be 'Quest Validation Error' Related_BGC_Order__r.Order_Status__c should not be 'Cancelled'
Related_BGC_Order__r.Order_Status__c should not be 'Deleted'

After satisfying above conditions exe is converting the data into xml format and posted it to web service for processing.
String xmlString = UpdateOrder( string Username, string Password, string OrderXML)
Update Order response: The UpdateOrder() Web Method will return an XML string response which describes the outcome of the Web Method request.

RemoveOrder method will cancel a previously placed “pending” order requesting drug testing collection services. Once the collection process has
retrieved a valid order it may not be canceled.

There are some conditions on BGC_DTOC_Order__c for removing order,
Partner_Location__r.Integration_Vendor_Name__c should be 'Quest Diagnostics'
Ready_For_E_Registration__c should be 'TRUE'
Related_BGC_Order__c should not be null
Drug_Integration_Status__c should be 'Quest Remove Order'
Reference_Test_ID__c should not be null
Reference_Test_ID__c should not be blank
Drug_Integration_Status__c should not be 'Quest Validation Error'
Any one of (Related_BGC_Order__r.Order_Status__c should be 'Cancelled' OR Related_BGC_Order__r.Order_Status__c shuold be 'Deleted')

After satisfying above conditions exe is converting the data into xml format and posted it to web service for processing.
String xmlString = RemoveOrder(string Username, string Password, string TestID)
Remove Order response: The RemoveOrder() Web Method will return an XML string response which describes the outcome of the Web Method request.

Processing of EXE :- There are three methods are defined for its order status i.e., 1) CallLabCorpRegisterDonor
2) CallLabCorpModifyRegistration
3) CallLabCorpDeleteRegistration
1) CallLabCorpRegisterDonor()

Step 1: Going to update the status and other fields in DTOC Order (oBGC_DTOC_Order__c) on the basis of some conditions which are as,
Partner_Location__r.Integration_Vendor_Name__c should be 'LabCorp Diagnostics'
Ready_For_E_Registration__c should be 'TRUE'
Related_BGC_Order__c should not be null
Drug_Integration_Status__c should be 'LabCorp Register Donor'
Related_BGC_Order__r.Order_Status__c should not be 'Cancelled'
Related_BGC_Order__r.Order_Status__c should not be 'Deleted'
Drug_Integration_Status__c should not be 'LabCorp Validation Error'
Drug_Test_Schedule_Complete__c should be false
Drug_Test_Collection_Complete__c should be false

Step 2: Downloaded the updated records to sql database into DrugTestingFullIntegrationService Table from salesforce for logging purpose

Step 1: Going to update the status and other fields in DTOC Order (BGC_DTOC_Order__c) on the basis of some conditions which are as,
'Partner_Location__r.Integration_Vendor_Name__c' should be 'LabCorp Diagnostics'
Ready_For_E_Registration__c should be 'TRUE'
Related_BGC_Order__c should not be null
Drug_Integration_Status__c should be 'LabCorp Modify Registration'
'Labcorp_Registration_Number__c' should not be null
Registration_Number__c should not be null
Related_BGC_Order__r.Order_Status__c should not be 'Cancelled'
Related_BGC_Order__r.Order_Status__c should not be 'Deleted'
Drug_Integration_Status__c should not be 'LabCorp Validation Error'

Step 2: Download the updated records to SQL database into DrugTestingFullIntegrationService Table from salesforce for logging purpose.

Step 1: Going to update the status and other fields in DTOC Order (BGC_DTOC_Order__c) on the basis of some conditions which are as,
Partner_Location__r.Integration_Vendor_Name__c should be 'LabCorp Diagnostics'
Ready_For_E_Registration__c should be 'TRUE'
'Related_BGC_Order__c' should not be null
Drug_Integration_Status__c should be 'LabCorp Delete Registration'
'Labcorp_Registration_Number__c' should not be null
Registration_Number__c should not be null
Any one of (Related_BGC_Order__r.Order_Status__c should be 'Cancelled' OR Related_BGC_Order__r.Order_Status__c should be 'Deleted')
Drug_Integration_Status__c should not be 'LabCorp Validation Error'

Step 2: Downloaded the updated records to SQL database into DrugTestingFullIntegrationService Table from salesforce for logging purpose.

Note: LabCorp, ReasonForTest and Panel Ids are defined in EXE code

QuestLabcorp_PreEmploy_IntegrationField_Mapping of fields from XML to Fields in salesforce