The currency symbol is set under the OPTIONS tab in Cab Grid. It is displayed along side any price that is calculated.
The currency symbol field can accept individual symbols ($,£,€, etc.) or HTML codes (e.g. € See https://www.toptal.com/designers/htmlarrows/currency/).
When online payment is available (via Paypal in Cab Grid Pro or via an Add-on such as the Stripe Integration add-on), the currency symbol set under OPTIONS is displayed to the customer. However, the currency charged will depend on how the payment gateway (e.g. Paypal or Stripe) is configured.
In other words, the currency symbol is an independent setting and does not effect online payment (if available).
Positioning the currency symbol before or after amount?
By default, the currency symbol appears before the calculated fare. It is possible to configure the currency symbol displayed with taxi prices calculated by Cab Grid either before or after the amount. This is done by defining a preference in either the _settings.php file or the defaults add-on (see Advanced Settings for Cab Grid Pro – Defaults add-on plugin).
Configure the $cabGridProPriceFormat variable as follows.
Before (e.g. $9.99):
After (e.g. 20€):