code: import stripe
  stripe.api_key = "sk_test_your_key"
  
  stripe.Customer.modify_balance_transaction(
    "cus_8TEMHVY5moxIPI",
    "cbtxn_1LSe4H2eZvKYlo2CfH2vNRxz",
    metadata={"order_id": "6735"},
  )
  '''Response {
    "id": "cbtxn_1LSe4H2eZvKYlo2CfH2vNRxz",
    "object": "customer_balance_transaction",
    "amount": -500,
    "created": 1659519645,
    "credit_note": null,
    "currency": "usd",
    "customer": "cus_8TEMHVY5moxIPI",
    "description": null,
    "ending_balance": -500,
    "invoice": null,
    "livemode": false,
    "metadata": {
      "order_id": "6735"
    },
    "type": "adjustment"
  }'''
nl: Update a customer credit balance transactionMost credit balance transaction fields are immutable, but you may update its description and metadata.Parameters description optional An arbitrary string attached to the object. Often useful for displaying to users. metadata optional dictionary Set of key-value pairs that you can attach to an object. This can be useful for storing additional information about the object in a structured format. Individual keys can be unset by posting an empty value to them. All keys can be unset by posting an empty value to metadata.ReturnsReturns a customer balance transaction object if the call succeeded