Limit a payment module to certain products, etc.

Can one limit a payment module (like Paypal, or Stripe) to a specific product, custom option, currency, etc?

I have products that I would like to discount when using a specific payment module (that I'm writing...it is Bitcoin-based). I would like to charge a premium for Paypal and Stripe (or discount for Bitcoin, etc.).

I'm currently looking into using either Geo Zones (payment modules can be limited to Geo Zones) or currency (if I setup Bitcoin as a currency in the system). Or I would be interested in just applying a percentage discount for a specific payment module.

Let me know if that's not a clear enough description of my situation. Many thanks.

Sure you can limit a payment module to certain conditions.

Just have options() return nothing and the option will not be shown.

Currency
if (currency::$selected['coode'] != 'XXX') return;

Products
if (!in_array(123, array_column($items, 'product_id'))) return;

Stock Options
if (!in_array('11-22', array_column($items, 'option_stock_combination'))) return;

If you return an error with the option the module will be visible but disabled. See the wiki article for creating payment modules.

I would be interested in introspecting the items attributes as selected or entered by the customer...I would really appreciate an example of that based off of the $items array.

Step through them like this:

  if (empty($item['options'])) continue;
  foreach ($item[options] as $attribute_name => $attribute_value) {
    var_dump($attribute_name, $attribute_value);
  }
}```