curl --request PUT \
  --url https://api-beta.pepay.io/api/v1/merchant/payment-return-url \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "payment_return_url": "https://merchant.example.com/checkout/complete"
}
'

{
  "payment_return_url": "<string>",
  "payment_return_url_enabled": true
}