Decline Payment Request

curl --request PATCH \
  --url https://server26-dot-royalti-project.uc.r.appspot.com/payment-request/{id}/decline \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "reason": "<string>"
}'

{
  "message": "Payment request declined successfully",
  "paymentRequest": {
    "id": "0654cd19-cea3-4fad-b92e-4033c4252c79",
    "status": "declined"
  }
}