We currently accept payment via Visa or MasterCard, as those are the cards accepted by our payment provider. We cannot currently accept American Express.
We also accept Paypal payments. At checkout, you will be redirected to PayPal's website to validate your PayPal account and presented with a billing agreement. After committing to the billing agreement, you will be redirected back to the Stockopedia confirmation page.
We have no plans to enable direct debit, Google or Amazon based payments now or in the future.
You can read more about payment security here.
Because PayPal requires a customer to create a billing agreement in order to pay for a subscription via PayPal, the only way to switch your payment method from credit card to Paypal would be to terminate your existing subscription and re-subscribe.