Supposing you needed some custom logic to happen immediately after a lead was qualified. You can achieve this by registering a Plug-in on the QualifyLead Post Operation stage. From within this Plug-in you can easily get a reference to the newly created Account, Contact and Opportunity and make any changes you need.
Inside the PlugIn you need the following code:
IOrganizationService service = localContext.OrganizationService;
// Get the qualified lead
EntityReference leadid = (EntityReference) localContext.PluginExecutionContext.InputParameters["LeadId"];
Lead lead = (Lead)service.Retrieve(leadid.LogicalName, leadid.Id,new ColumnSet(LeadAttributes.crm_AccountType));
// Get the newly created account, contact, opportunity
Contact contact = null;
Opportunity opportunity = null;
Account account = null;
foreach (EntityReference created in (IEnumerable<object>) localContext.PluginExecutionContext.OutputParameters["CreatedEntities"])
{
switch (created.LogicalName)
{
case Contact.EntityLogicalName:
contact = (Contact)service.Retrieve(Contact.EntityLogicalName, created.Id, new ColumnSet(true));
break;
case Account.EntityLogicalName:
account = (Account)service.Retrieve(Account.EntityLogicalName, created.Id, new ColumnSet(true));
break;
case Opportunity.EntityLogicalName:
opportunity = (Opportunity)service.Retrieve(Opportunity.EntityLogicalName, created.Id, new ColumnSet(true));
break;
}
}
If you need to make any changes to the created records, you can simply use:
contact.LastName = "some change";
service.Update(contact);
Hope this helps.