feat(premium): native Nordic prices and subscribing during grace (#3274)

fluxer_api/src/api/donation/services/DonationCheckoutService.ts

@@ -6,6 +6,7 @@ import type {IDonationRepository} from '@app/api/donation/IDonationRepository';
 import type {IEmailDnsValidationService} from '@app/api/infrastructure/IEmailDnsValidationService';
 import {Logger} from '@app/api/Logger';
 import {getBillingRepository} from '@app/api/middleware/ServiceRegistry';
+import {shouldDisableAdaptivePricing} from '@app/api/utils/CurrencyUtils';
 import {ValidationErrorCodes} from '@fluxer/constants/src/ValidationErrorCodes';
 import {InputValidationError} from '@fluxer/errors/src/domains/core/InputValidationError';
 import {DonationAmountInvalidError} from '@fluxer/errors/src/domains/donation/DonationAmountInvalidError';
@@ -173,6 +174,7 @@ export class DonationCheckoutService {
 					enabled: true,
 				},
 				...(isBusiness ? {billing_address_collection: 'required' as const} : {}),
+				...(shouldDisableAdaptivePricing(params.currency) ? {adaptive_pricing: {enabled: false}} : {}),
 				...(mode === 'payment'
 					? {
 							customer_creation: 'always' as const,

fluxer_api/src/api/donation/tests/DonationCheckout.test.ts

@@ -131,6 +131,8 @@ describe('POST /donations/checkout', () => {
 			  }
 			| undefined;
 		expect(lineItem?.price_data?.currency).toBe(currency);
+		const nordic = ['sek', 'dkk', 'nok'].includes(currency);
+		expect(session?.adaptive_pricing).toEqual(nordic ? {enabled: 'false'} : undefined);
 	});
 	test('accepts monthly interval', async () => {
 		const response = await createDonationCheckoutBuilder(harness)