Get & Update Invoice Custom Fields in Zoho Books

 				 					// Get Record and Organization Variables invoiceId = invoice.get('invoice_id'); organizationId = organization.get('organization_id');  /*  Get Custom Fields from Record  */ // Get Custom Fields and Iterate over each Custom Field customFields = invoice.get('custom_fields').toList(); for each  customField in customFields { 	label = customField.get('label'); 	value = customField.get('value'); }  /*  Update Custom Fields on Record  */ // Create List of Custom Fields customFieldList = List(); customFieldMap1 = Map(); customFieldMap1.put('label', 'YOUR CUSTOM FIELD LABEL'); customFieldMap1.put('value', 'YOUR CUSTOM FIELD VALUE'); customFieldList.add(customFieldMap1);  // Create Map for Updating the Invoice updateInvoiceMap = Map(); updateInvoiceMap.put('custom_fields', customFieldList);  // Update Invoice updateInvoice = zoho.books.updateRecord('Invoices', organizationId, invoiceId, updateInvoiceMap); info updateInvoice;