{
  "id": "<String>",
  "payer": "<String of size 64 containing lowercase hex characters.>",
  "receiver": "<String of size 64 containing lowercase hex characters.>"
}

{
  "Enum": [
    {
      "ParseParams": []
    },
    {
      "CallerNotAdminError": []
    },
    {
      "InvoiceNotFoundError": []
    },
    {
      "InvoiceAlreadyPaid": []
    },
    {
      "InvokeContractError": []
    },
    {
      "InvoiceAlreadyExists": []
    }
  ]
}

None

"<String>"

{
  "Enum": [
    {
      "ParseParams": []
    },
    {
      "CallerNotAdminError": []
    },
    {
      "InvoiceNotFoundError": []
    },
    {
      "InvoiceAlreadyPaid": []
    },
    {
      "InvokeContractError": []
    },
    {
      "InvoiceAlreadyExists": []
    }
  ]
}

None

{
  "index": "<UInt64>",
  "subindex": "<UInt64>"
}

{
  "Enum": [
    {
      "ParseParams": []
    },
    {
      "CallerNotAdminError": []
    },
    {
      "InvoiceNotFoundError": []
    },
    {
      "InvoiceAlreadyPaid": []
    },
    {
      "InvokeContractError": []
    },
    {
      "InvoiceAlreadyExists": []
    }
  ]
}

None