curl --request POST \
  --url https://sandbox-biller-b2b.singapay.id/api/v1/postpaid/payment \
  --header 'Accept: <accept>' \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-PARTNER-ID: <x-partner-id>' \
  --data '
{
  "command": "plnpos",
  "data": {
    "password": "merchant_password",
    "product_code": "SPPLNPOS",
    "customer_id": "146300068064",
    "reference_number": "SPPLNPOSRJBL0080217757411749548209"
  }
}
'

{
  "command": "plnpos",
  "response_code": "00",
  "response_text": "Payment success",
  "data": {
    "amount": "151005",
    "customer_name": "NARSONO",
    "period": "202403",
    "customer_id": "146300068064",
    "price": "152505",
    "transaction_id": "01JXCK6K1CMRGJKQ2J863Q6P5J",
    "created_at": "2025-06-10 16:37:02"
  }
}