curl --request POST \
  --url 'https://api.stateset.com/api/v1/ar/payment-applications' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "applications": [
    {
      "amount": "string",
      "invoice_id": "string"
    }
  ],
  "payment_id": "string"
}'

{
  "applications": [
    {
      "applied_amount": "string",
      "applied_date": "string",
      "id": "string",
      "invoice_id": "string",
      "payment_id": "string"
    }
  ],
  "total": 1
}