@RestResource(URLMapping = '/OpportunityService/*')
global class OpportunityRecord 
{
    @HttpGet()
    global static list<Opportunity> GetOpportunityRelated ()
    {
        
      Map<string, string> inputParams = RestContext.request.Params;
        
        list<Opportunity> lstOpportunity = [select id,name, amount, stagename, closedate, accountId, Account.Name
                                             from Opportunity where Account.Name =: inputParams.Get('accName')];
        
        return lstOpportunity;
        
    }