Avalara Custom Settings

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global class SCMAVACompanyCode extends SCMAVA CompanyCodePlugin {
    // If FFA is being used, this is very simple. Add a text 
    // field (25 characters) to the FFA Company object.
    // This new field holds the Company Code that has been set up in Avalara.
    // Then simply use the same logic to determine the FFA company to determine the Avalara company.

    global SCMAVACompanyCode() { }
    global override string GetCompanyCode(Id recordId) {
 
        Schema.SObjectType objType = getObjectTypeFromId(recordId);
        if (objType == SCMC__Customer_Quotation__c.sObjectType) {
             SCMC__Customer_Quotation__c quote = [select Id
                    , Company__r.Avalara_Company_Code__c
                    from SCMC__Customer_Quotation__c
                    where Id = :recordId];
             return quote.Company__r.Avalara_Company_Code__c;;
        } else if (objType == SCMC__Sales_Order__c.sObjectType) {
            SCMC__Sales_Order__c so = [select Id
                    , Company__r.Avalara_Company_Code__c
                    from SCMC__Sales_Order__c
                    where Id = :recordId];
 
            return so.Company__r.Avalara_Company_Code__c;
        } else if (objType == SCMC__Invoicing__c.sObjectType) {
             SCMC__Invoicing__c inv = [select Id
                    , Company__r.Avalara_Company_Code__c
                    from SCMC__Invoicing__c
                    where Id = :recordId];
 
             return inv.Company__r.Avalara_Company_Code__c;
 
        } else if (objType == SCMC__Credit_Invoice__c.sObjectType) {
             SCMC__Credit_Invoice__c crInv = [select Id
                    , SCMC__Invoicing__r.Company__r.Avalara_Company_Code__c
                    from SCMC__Credit_Invoice__c
                    where Id = :recordId];
             return crInv.SCMC__Invoicing__r.Company__r.Avalara_Company_Code__c;
        } else if (objType == SCMC__Purchase_Order__c.sObjectType) {
                    SCMC__Purchase_Order__c po = [select Id
                    , Company__r.Avalara_Company_Code__c
                    from SCMC__Purchase_Order__c
                    where Id = :recordId];
             return po.Company__r.Avalara_Company_Code__c;
 
        } else if (objType == SCMC__AP_Voucher__c.sObjectType) {
             SCMC__AP_Voucher__c voucher = [select Id
                    , SCMC__Purchase_Order__r.Company__r.Avalara_Company_Code__c
                    from SCMC__AP_Voucher__c
                    where Id = :recordId];
 
             return voucher.SCMC__Purchase_Order__r.Company__r.Avalara_Company_Code__c;
 
        } else if (objType == SCMC__AP_Voucher_Credit__c.sObjectType) {
             SCMC__AP_Voucher_Credit__c voucherCr = [select Id
                    , SCMC__Purchase_Order__r.Company__r.Avalara_Company_Code__c
                    from SCMC__AP_Voucher_Credit__c
                    where Id = :recordId];
 
             return voucherCr.SCMC__Purchase_Order__r.Company__r.Avalara_Company_Code__c;
        }
        // returning null will use the default company set up in Avalara
        return null;
    }
 
    private Schema.SObjectType getObjectTypeFromId(Id recordId) {
 
        Map<string,Schema.SObjectType> theMap = new Map<string,Schema.SObjectType>();
 
        string recordIdPrefix = ((string)recordId).substring(0,3);
        for (Schema.SObjectType so : Schema.getGlobalDescribe().values()) {
            Schema.DescribeSObjectResult od = so.getDescribe();
            if (od.getKeyPrefix() != null) {
                theMap.put(od.getKeyPrefix(), od.getSobjectType());
            }
        }
 
        return theMap.get(recordIdPrefix);
    }
}