Add per-quantity TPago payment links for multi-ticket checkout.

Each ticket quantity (1-5) can have its own TPago link so checkout, emails, and admin config use the correct fixed-amount URL.

backend/src/lib/email.ts

@@ -748,6 +748,10 @@ export const emailService = {
     const defaults = {
       tpagoEnabled: false,
       tpagoLink: null,
+      tpagoLink2: null,
+      tpagoLink3: null,
+      tpagoLink4: null,
+      tpagoLink5: null,
       tpagoInstructions: null,
       tpagoInstructionsEs: null,
       bankTransferEnabled: false,
@@ -766,6 +770,10 @@ export const emailService = {
     return {
       tpagoEnabled: overrides?.tpagoEnabled ?? global.tpagoEnabled,
       tpagoLink: overrides?.tpagoLink ?? global.tpagoLink,
+      tpagoLink2: overrides?.tpagoLink2 ?? global.tpagoLink2,
+      tpagoLink3: overrides?.tpagoLink3 ?? global.tpagoLink3,
+      tpagoLink4: overrides?.tpagoLink4 ?? global.tpagoLink4,
+      tpagoLink5: overrides?.tpagoLink5 ?? global.tpagoLink5,
       tpagoInstructions: overrides?.tpagoInstructions ?? global.tpagoInstructions,
       tpagoInstructionsEs: overrides?.tpagoInstructionsEs ?? global.tpagoInstructionsEs,
       bankTransferEnabled: overrides?.bankTransferEnabled ?? global.bankTransferEnabled,
@@ -885,7 +893,9 @@ export const emailService = {
 
     // Add payment-method specific variables
     if (payment.provider === 'tpago') {
-      variables.tpagoLink = paymentConfig.tpagoLink || '';
+      // Select the TPago link matching the number of tickets (1-5), falling back to the base link
+      const tpagoLinkKey = ticketCount <= 1 ? 'tpagoLink' : `tpagoLink${Math.min(ticketCount, 5)}`;
+      variables.tpagoLink = paymentConfig[tpagoLinkKey] || paymentConfig.tpagoLink || '';
     } else {
       // Bank transfer
       variables.bankName = paymentConfig.bankName || '';