code: public List<CoinbasePaymentMethod> getCoinbasePaymentMethods() throws IOException {
      String apiKey = exchange.getExchangeSpecification().getApiKey();
      BigDecimal timestamp = coinbase.getTime(Coinbase.CB_VERSION_VALUE).getData().getEpoch();
  
      return coinbase
          .getPaymentMethods(Coinbase.CB_VERSION_VALUE, apiKey, signatureCreator2, timestamp)
          .getData();
    }
docs: Authenticated resource that shows the current user payment methods.
  
  @see <a
  href="https://developers.coinbase.com/api/v2#list-payment-methods">developers.coinbase.com/api/v2?shell#list-payment-methods</a>