fix(scripts): helcim plan-create payload shape + empty-GET handling

Verified against the live Helcim v2 API during the deploy migration:
- POST /payment-plans requires { paymentPlans: [plan] } wrapper (mirrors
  the POST /subscriptions shape), and response is { data: [plan] }.
- taxType 'customer' rejects as ERR_VALIDATION_FAILED; must be 'no_tax'
  with taxCalculation 'country_province'.
- termLength:1 rejects when termType:'forever' — drop the field.
- GET /subscriptions returns an empty body (not JSON) when no subs exist;
  tolerate that instead of failing with 'Unexpected end of JSON input'.

Plans created in the Helcim account: Monthly=50302, Annual=50303.

scripts/helcim-plan-consolidation.js

@@ -44,8 +44,12 @@ const ANNUAL_PLAN = {
   billingPeriod: 'yearly',
 }
 
+// Shape mirrors the pre-migration legacy plans (verified via backup dump).
+// taxType:'customer' + missing taxCalculation/termLength caused ERR_VALIDATION_FAILED.
 const HELCIM_PLAN_PAYLOAD_BASE = {
-  description: 'Ghost Guild membership',
+  businessName: '',
+  businessEmail: '',
+  description: '',
   type: 'subscription',
   status: 'active',
   currency: 'CAD',
@@ -54,8 +58,10 @@ const HELCIM_PLAN_PAYLOAD_BASE = {
   dateBilling: 'Sign-up',
   termType: 'forever',
   freeTrialPeriod: 0,
-  taxType: 'customer',
+  taxType: 'no_tax',
+  taxCalculation: 'country_province',
   paymentMethod: 'card',
+  isProrated: 'no',
 }
 
 // ---------------------------------------------------------------------------
@@ -87,11 +93,12 @@ async function helcimGet(path) {
   const res = await fetch(`${HELCIM_API_BASE}${path}`, {
     headers: helcimHeaders(),
   })
-  if (!res.ok) {
   const body = await res.text()
+  if (!res.ok) {
     throw new Error(`GET ${path} failed (${res.status}): ${body}`)
   }
-  return res.json()
+  if (!body.trim()) return []
+  try { return JSON.parse(body) } catch { return [] }
 }
 
 async function helcimDelete(path) {
@@ -280,9 +287,10 @@ async function main() {
       console.log(`  [DRY RUN] Would POST /payment-plans with:`)
       console.log('   ', JSON.stringify(monthlyPayload, null, 4).split('\n').join('\n    '))
     } else {
+      const wrapped = { paymentPlans: [monthlyPayload] }
       console.log(`  POSTing /payment-plans with:`)
-      console.log('   ', JSON.stringify(monthlyPayload, null, 4).split('\n').join('\n    '))
+      console.log('   ', JSON.stringify(wrapped, null, 4).split('\n').join('\n    '))
-      const result = await helcimPost('/payment-plans', monthlyPayload)
+      const result = await helcimPost('/payment-plans', wrapped)
       if (!result.ok) {
         console.error(`  [ERROR] POST failed (${result.status}):`)
         console.error('  ', JSON.stringify(result.body, null, 2))
@@ -290,7 +298,7 @@ async function main() {
         await mongoose.disconnect()
         process.exit(1)
       }
-      monthlyPlanId = result.body.id
+      monthlyPlanId = result.body.data?.[0]?.id ?? result.body.paymentPlans?.[0]?.id ?? result.body.id
       console.log(`  [OK] Created Monthly Membership plan id: ${monthlyPlanId}`)
     }
     console.log()
@@ -313,9 +321,10 @@ async function main() {
       console.log('  Note: billingPeriod="yearly" is Helcim v2 convention.')
       console.log('  If 4xx on --confirm, check the Helcim API docs for the correct field value.')
     } else {
+      const wrapped = { paymentPlans: [annualPayload] }
       console.log(`  POSTing /payment-plans with:`)
-      console.log('   ', JSON.stringify(annualPayload, null, 4).split('\n').join('\n    '))
+      console.log('   ', JSON.stringify(wrapped, null, 4).split('\n').join('\n    '))
-      const result = await helcimPost('/payment-plans', annualPayload)
+      const result = await helcimPost('/payment-plans', wrapped)
       if (!result.ok) {
         console.error(`  [ERROR] POST failed (${result.status}):`)
         console.error('  ', JSON.stringify(result.body, null, 2))
@@ -324,7 +333,7 @@ async function main() {
         await mongoose.disconnect()
         process.exit(1)
       }
-      annualPlanId = result.body.id
+      annualPlanId = result.body.data?.[0]?.id ?? result.body.paymentPlans?.[0]?.id ?? result.body.id
       console.log(`  [OK] Created Annual Membership plan id: ${annualPlanId}`)
     }
     console.log()