Subscription's unique identifier.

Optional notes field. This will default to the Terms and Conditions text specified on the Invoice Settings page in your Recurly admin, unless custom notes were created with the original subscription. Specify custom notes with this tag to add or override Terms and Conditions. Custom notes will stay with a subscription on all renewals, unless updated before renewal. Will always change immediately, even if timeframe = term_end.

Optional notes field. This will default to the Customer Notes text specified on the Invoice Settings page in your Recurly admin, unless custom notes were created with the original subscription. Specify custom notes with this tag to add or override Customer Notes. Custom notes will stay with a subscription on all renewals. Will always change immediately, even if timeframe = term_end.

VAT Reverse Charge Notes only appear if you have EU VAT enabled or are using your own Avalara AvaTax account and the customer is in the EU, has a VAT number, and is in a different country than your own. This will default to the VAT Reverse Charge Notes text specified on the Tax Settings page in your Recurly admin, unless custom notes were created with the original subscription. Specify custom notes with this tag to add or override VAT Reverse Charge Notes. Custom notes will stay with a subscription on all renewals. Will always change immediately, even if timeframe = term_end.

An alphanumeric code shown per gateway on your site's payment gateways page. Set this code to ensure that a given subscription targets a given gateway.