fix(join): persist billingCadence on /join signup

Mirror of the invite-accept fix (c3b1c59) for the self-serve /join path. A joiner who picked annual but abandoned before /api/helcim/subscription ran was left at billingCadence:'monthly' (the model default) with a cadence-unit contributionAmount, rendering $180/mo in admin views.

join.vue now sends cadence to /api/helcim/customer; helcimCustomerSchema accepts cadence (defaults 'monthly'); customer.post.js persists billingCadence in both the new-member create branch and the guest-upgrade $set branch, forced to 'monthly' for $0 signups.

app/pages/join.vue

@@ -432,6 +432,7 @@ const handleSubmit = async () => {
         email: form.email,
         circle: form.circle,
         contributionAmount: form.contributionAmount,
+        cadence: cadence.value,
         agreedToGuidelines: form.agreedToGuidelines,
         billingAddress: form.billingAddress,
       },

server/api/helcim/customer.post.js

@@ -62,6 +62,7 @@ export default defineEventHandler(async (event) => {
             name: body.name,
             circle: body.circle,
             contributionAmount: body.contributionAmount,
+            billingCadence: body.contributionAmount === 0 ? 'monthly' : body.cadence,
             helcimCustomerId: customerData.id,
             helcimCustomerCode: customerData.customerCode,
             status: 'pending_payment',
@@ -76,6 +77,7 @@ export default defineEventHandler(async (event) => {
         name: body.name,
         circle: body.circle,
         contributionAmount: body.contributionAmount,
+        billingCadence: body.contributionAmount === 0 ? 'monthly' : body.cadence,
         helcimCustomerId: customerData.id,
         helcimCustomerCode: customerData.customerCode,
         status: 'pending_payment',

server/utils/schemas.js

@@ -63,6 +63,7 @@ export const helcimCustomerSchema = z.object({
   email: z.string().trim().toLowerCase().email(),
   circle: z.enum(['community', 'founder', 'practitioner']).optional().default('community'),
   contributionAmount: z.number().int().min(0).optional(),
+  cadence: z.enum(['monthly', 'annual']).default('monthly'),
   agreedToGuidelines: z.literal(true)
 })
 

tests/server/api/helcim-customer.test.js

@@ -385,4 +385,67 @@ describe('POST /api/helcim/customer', () => {
       expect(setAuthCookie).not.toHaveBeenCalled()
     })
   })
+
+  // Regression: a joiner who picks annual but abandons before
+  // /api/helcim/subscription runs must already have billingCadence persisted,
+  // otherwise contributionAmount (cadence-unit, e.g. 180) renders as "$180/mo".
+  describe('billingCadence persistence', () => {
+    it('persists billingCadence "annual" when a new member signs up annual', async () => {
+      Member.findOne.mockResolvedValue(null)
+      const event = build({
+        body: {
+          name: 'Annual Joiner',
+          email: 'annual@example.com',
+          circle: 'community',
+          contributionAmount: 180,
+          cadence: 'annual',
+          agreedToGuidelines: true
+        }
+      })
+      await customerHandler(event)
+      expect(Member.create).toHaveBeenCalledWith(
+        expect.objectContaining({ contributionAmount: 180, billingCadence: 'annual' })
+      )
+    })
+
+    it('persists billingCadence "annual" when upgrading a guest who signs up annual', async () => {
+      Member.findOne.mockResolvedValue({
+        _id: 'guest-annual',
+        email: 'guest@example.com',
+        status: 'guest'
+      })
+      const event = build({
+        body: {
+          name: 'Guest Annual',
+          email: 'guest@example.com',
+          circle: 'founder',
+          contributionAmount: 180,
+          cadence: 'annual',
+          agreedToGuidelines: true
+        }
+      })
+      await customerHandler(event)
+      expect(Member.create).not.toHaveBeenCalled()
+      const [, updatePayload] = Member.findByIdAndUpdate.mock.calls[0]
+      expect(updatePayload.$set).toMatchObject({ contributionAmount: 180, billingCadence: 'annual' })
+    })
+
+    it('forces billingCadence "monthly" for a $0 signup even when cadence is annual', async () => {
+      Member.findOne.mockResolvedValue(null)
+      const event = build({
+        body: {
+          name: 'Free Joiner',
+          email: 'free@example.com',
+          circle: 'community',
+          contributionAmount: 0,
+          cadence: 'annual',
+          agreedToGuidelines: true
+        }
+      })
+      await customerHandler(event)
+      expect(Member.create).toHaveBeenCalledWith(
+        expect.objectContaining({ contributionAmount: 0, billingCadence: 'monthly' })
+      )
+    })
+  })
 })