Add PromptPay support (#5)

* Handle PromptPay QR flow

* Send billing email for PromptPay

* fix isort

* Update payment.py

* Update signals.py

---------

Co-authored-by: Chondaen <chondaen12@1000WA>

src/pretix/plugins/stripe/payment.py

@@ -137,7 +137,7 @@ logger = logging.getLogger('pretix.plugins.stripe')
 # Real-time payments
 # - Swish: ✓
 # - PayNow: ✗
-# - PromptPay: ✗
+# - PromptPay: ✓
 # - Pix: ✗
 #
 # Vouchers
@@ -428,6 +428,14 @@ class StripeSettingsHolder(BasePaymentProvider):
                                  'before they work properly.'),
                      required=False,
                  )),
+                ('method_promptpay',
+                 forms.BooleanField(
+                     label='PromptPay',
+                     disabled=self.event.currency != 'THB',
+                     help_text=_('Some payment methods might need to be enabled in the settings of your Stripe account '
+                                 'before they work properly.'),
+                     required=False,
+                 )),
                 ('method_swish',
                  forms.BooleanField(
                      label=_('Swish'),
@@ -1842,6 +1850,31 @@ class StripeSwish(StripeRedirectMethod):
         }
 
 
+class StripePromptPay(StripeRedirectMethod):
+    identifier = 'stripe_promptpay'
+    verbose_name = _('PromptPay via Stripe')
+    public_name = 'PromptPay'
+    method = 'promptpay'
+    confirmation_method = 'automatic'
+    explanation = _(
+        'This payment method is available to PromptPay users in Thailand. Please have your app ready.'
+    )
+
+    def is_allowed(self, request: HttpRequest, total: Decimal=None) -> bool:
+        return super().is_allowed(request, total) and request.event.currency == "THB"
+
+    def _payment_intent_kwargs(self, request, payment):
+        return {
+            "payment_method_data": {
+                "type": "promptpay",
+                "billing_details": {
+                    "email": payment.order.email,
+                },
+
+            },
+        }
+
+
 class StripeTwint(StripeRedirectMethod):
     identifier = 'stripe_twint'
     verbose_name = _('TWINT via Stripe')