Memo

Decode MixPay payment's memo.

If you use Mixin API GET /snapshots, you can get the following response. MixPay settings send the parameter Memo.

// title: Response
{
  "data": [
    {
      "type": "transfer",
      "snapshot_id": "922a6f2c-206e-4a05-863d-a542c4e32227",
      "opponent_id": "a37c0fcf-1fd6-4375-a7f8-7ec6e2544c7b",
      "asset_id": "25dabac5-056a-48ff-b9f9-f67395dc407c",
      "amount": "1",
      "opening_balance": "32.65891055",
      "closing_balance": "33.65891055",
      "trace_id": "6aaf1873-d834-4d39-954f-c79eaa07f768",
      "memo": "UE18ZDI0OWQwNDYtZjYzOC00NDFjLThlNDMtOThjZGI1N2EzMmM2fFRoaXMgaXMgbXkgY3VzdG9tIG1lbW9+IDEwMCBjaGFyIG9ubHk=",
      "created_at": "2022-03-22T09:53:13.50183Z",
      "counter_user_id": "a37c0fcf-1fd6-4375-a7f8-7ec6e2544c7b"
    }
  ]
}

Parse the parameters in the response memo via base64_decode; you can get the original information.

// title: Response
base64_decode('UE18ZDI0OWQwNDYtZjYzOC00NDFjLThlNDMtOThjZGI1N2EzMmM2fFRoaXMgaXMgbXkgY3VzdG9tIG1lbW9+IDEwMCBjaGFyIG9ubHk')
PM|d249d046-f638-441c-8e43-98cdb57a32c6

Refund format, the last segment is refund error code, all possible code are here:

RF|12c55575-c85a-4b58-a245-19e6b678eee9|40025

Memo Specification

Each parameter is separated by | and encoded in base64 format.

And the parameters include SOURCE|TRACE|EXPAND. Below is the detailed parameter information.

CODE	SOURCE	TRACE	EXPAND
Payment	PM (Payment)	TraceId
Withdraw	WD (Withdraw)	TraceId of the paid EPC transaction
Free EPC on first transfer	SE(SendEPC)
Pay with Mixin Messenger refund	RF (Refund)	TraceId
On-chain payment refund	CF(Chain Refund)