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Overview

To add metadata to an entity (such as a ledger, balance, transaction, identity, or balance monitor), include the meta_data object in the JSON payload when creating or updating the item. The meta_data object is a flexible key-value store that allows you to attach custom data to an entity.

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Basic example

Below is a simple example of how to include metadata when creating an entity: 
{
  ...
  "meta_data": {
    "key": "value"
  }
}
  • Key: A unique identifier for the metadata attribute (e.g., “purpose”, “external_id”).
  • Value: The corresponding value for that key (e.g., “payment”, “INV-12345”).
This basic structure can be expanded to include multiple key-value pairs, depending on the complexity of the information you need to store.

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Expanded example with more fields

For a transaction, you might want to include several pieces of metadata, such as the transaction purpose, the associated invoice, and the account information of the sender: 
{
  "amount": 1029.12,
  "precision": 100,
  "currency": "USD",
  "reference": "ref_00a8f264-6367-4617-abc8-e661431d3b7b",
  "source": "@Deposit_USD",
  "destination": "bal_d0cb79eb-cdc4-4a0d-af00-f5aaf15721ae",
  "allow_overdraft": true,
  "description": "Payment for services",
  "meta_data": {
    "invoice_id": "INV-12345",
    "initiated_by": "Jason Burke",
    "timestamp": "2023-10-01T12:00:00Z",
    "sender_name": "Oakley Stationeries",
    "sender_bank": "12345678901234",
    "routing_number": "123456789",
    "source_country": "United States"
  }
}

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Retrieving metadata

Once metadata is attached to an entity, it can be retrieved by using the Search API or GET endpoint for the respective entity. For example, when fetching a transaction, the response will include the meta_data object along with the core transaction details.
Response
{
    "id": "txn_6164573b-6cc8-45a4-ad2e-7b4ba6a60f7d",
    "source": "@FundingPool",
    "destination": "bln_ebcd230f-6265-4d4a-a4ca-45974c47f746",
    "reference": "ref_001adcfgf",
    "amount": 750,
    "precision": 100,
    "precise_amount": 75000,
    "currency": "USD",
    "description": "Fund with starting balance amount",
    "allow_overdraft": true,
    "status": "QUEUED",
    "created_at": "2024-12-21T01:36:46.997063436Z",
    "meta_data": {
      "sender_name": "John Doe",
      "sender_account": "00000000000"
    }
}

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Need help?

We are very happy to help you make the most of Blnk, regardless of whether it is your first time or you are switching from another tool. To ask questions or discuss issues, please contact us or join our Discord community.
Tip: Connect to Blnk Cloud to see your Core data.You can view your transactions, manage identities, create custom reports, invite other team members to collaborate, and perform operations on your Core — all in one dashboard.Check out Blnk Cloud →
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