Refactor; split the conditional branching into two

class-wc-settings-page-komoju.php

@@ -371,14 +371,15 @@ private function fetch_all_payment_methods()
                 $slug        = $payment_method['type_slug'];
                 $pm_currency = $payment_method['currency'];
 
-                // If the payment method satisfies both of these two conditions, reject it:
-                // 1.  There is an alternative payment method with the same slug (possibly with a more preferable currency)
-                // 2.  The currency for the payment method defers from the default currency for the WooCommerce configuration
-                // That means, we accept payment methods if and only if
-                // 1.  there is no alternative payment method with the same slug, OR
-                // 2.  an alternative payment method with the same slug exists, but the currency for the payment method matches to the currency for the WooCommerce configuration and thus preferred
-                if (isset($methods_by_slug[$slug]) && $pm_currency !== $wc_currency) {
-                    continue;
+                // If $slug is not set, register
+                if (!isset($methods_by_slug[$slug])) {
+                    $methods_by_slug[$slug] = $payment_method;
+                } else {
+                    // If $slug is already registered and
+                    // the payment currency matches the WooCommerce currency then override it
+                    if ($pm_currency === $wc_currency) {
+                        $methods_by_slug[$slug] = $payment_method;
+                    }
                 }
 
                 $methods_by_slug[$slug] = $payment_method;