Returns the conversion rate between 2 currencies.
This method may require higher-level permissions than the caller has, based on their identity and roles and permissions. In these cases, you can ensure the method is called with the required level of authorization by using one of the following:
Identifying details needed to get the conversion rate. The combination of the from and to properties together comprise the unique ID.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.