Cannot activate trialing subscription without payment method

{
  "error": {
    "type": "request_error",
    "code": "subscription_missing_payment_method_cannot_activate",
    "detail": "Automatically-collected subscriptions in trial require a payment method to be activated.",
    "documentation_url": "https://developer.paddle.com/errors/subscriptions/subscription_missing_payment_method_cannot_activate"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}

Details

Status code

400

Error code

subscription_missing_payment_method_cannot_activate

Error message

Automatically-collected subscriptions in trial require a payment method to be activated.

Common causes

• The trialing subscription doesn't have a payment method set, so it can't transition to active.
• If the customer_id against this subscription has been replaced recently, the payment method against it was removed for security. It must be readded.

Troubleshooting

• Create a customer portal session to capture a payment method from the customer, then retry the activation.
• Get a transaction to update payment method and pass to Paddle.js to capture a payment method from the customer, then retry the activation.
• Change collection mode against the subscription to manual, then retry the activation. Paddle sends an invoice for the amount due each time a subscription renews or a charge is made.