How to access payment_data on process_payment function

[Alecostantini]

I've used this module and implement some modifications like following this url https://github.com/woocommerce/woocommerce-blocks/blob/trunk/docs/internal-developers/block-client-apis/checkout/checkout-api.md#usepaymentmethodinterface

{ "shipping_address": {}, "billing_address": {}, "customer_note": "", "create_account": false, "payment_method": "bacs", "payment_data": [ { "key": "myGatewayCustomData", "value": "12345" } ], "extensions": {} }

So, how can I access the payment_data, like myGatewayCustomData on process_payment function in that $order variable?