INTERNAL_SERVICE_ERROR REST/v1/payments/payment

[Jypar]

When I call "create payment" getting following response:

{
"name": "INTERNAL_SERVICE_ERROR",
"message": "An internal service error has occurred",
"information_link": "https://developer.paypal.com/docs/api/payments/#errors",
"debug_id": "1c37b0164aaa"
}

my request body:

{
"intent": "NONE",
"payer": {
"payment_method": "paypal"
},
"transactions": [
{
"amount": {
"currency": "RUB",
"total": "30.00"
},
"description": "order"
}
],
"redirect_urls": {
"return_url": "http://localhost:8888/pay/success",
"cancel_url": "http://localhost:8888/pay/cancel"
}
}