Send a Payment Request

POST /api/v1/payment_requests/:id/send

const result = await paybytoken.paymentRequests.send(
  request.id,
  {
    schedule_reminder: true,
    reminder_days_before_due: 3,
  },
  { idempotencyKey: 'payment-request:PO-1042:send' },
)

recipient_email may override the request recipient. It is required if the request has no stored customer email. Only open requests can be sent.

The API schedules delivery; it does not synchronously send email. Each delivery moves through pending, processing, and then sent, failed, or canceled. sent means the provider accepted the message. It does not prove final mailbox delivery or that the recipient opened it.

Failed sends retry with bounded backoff. Automatic reminders are canceled when the request becomes paid, canceled, or expired. Calling send again creates a merchant-triggered reminder rather than rewriting prior delivery history.