In contrast to in-person payments, it is easier to find ecommerce solutions in the territories outside United Kingdom. It will, however, vary which online gateways (the payment processing system of an online store) are available in the different regions.
The best ecommerce platform for online businesses is Shopify. This will work nearly everywhere and gives you a choice of payment solutions specific to your area.
To search the online gateways available in your region, we recommend looking up your geographical location here.
Stripe, unfortunately, does not support businesses in the British Crown Dependencies (Guernsey, Jersey, Isle of Man) or any British Overseas Territories.