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;