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Inconsistent customer creation via hosted checkout URL

Issue:
Customers subscribing via our hosted checkout URL are randomly
not being created in the dashboard. No error is shown to the user
or returned via webhook. The same checkout URL and process is
followed for all users.

Example missing email: [email protected]
Company domain: exactflow

Checkout URL used:
https://checkout.billsby.com/subscription?data-billsby-company=exactflow
&data-billsby-product=30478&data-billsby-plan=46455&data-billsby-cycle=55320

Observed behavior:

  • Checkout shows success screen
  • No customer record created in dashboard
  • No webhook fired (SubscriptionCreated, CustomerCreated)
  • Happens randomly — some users ARE created, some are not
  • Same product/plan/cycle/process for all users

Expected behavior:

  • Every completed checkout should create a customer and subscription
  • SubscriptionCreated webhook should fire every time