spendError property
SpendError is why this channel's spend could not be read (connector not connected, provider error), as one secret-free line. Present only on failure; the campaign total then simply omits this channel rather than failing.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? spendError;