curl --request GET \
  --url https://api.developer.coinbase.com/onramp/v1/buy/transactions \
  --header 'Authorization: Bearer <token>'

{
  "nextPageKey": "<string>",
  "transactions": [
    {
      "coinbaseFee": {
        "currency": "<string>",
        "value": "<string>"
      },
      "completedAt": "2023-11-07T05:31:56Z",
      "contractAddress": "<string>",
      "country": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "endPartnerName": "<string>",
      "exchangeRate": {
        "currency": "<string>",
        "value": "<string>"
      },
      "failureReason": "FAILURE_REASON_BUY_FAILED",
      "networkFee": {
        "currency": "<string>",
        "value": "<string>"
      },
      "partnerUserRef": "<string>",
      "paymentMethod": "UNSPECIFIED",
      "paymentSubtotal": {
        "currency": "<string>",
        "value": "<string>"
      },
      "paymentTotal": {
        "currency": "<string>",
        "value": "<string>"
      },
      "paymentTotalUsd": {
        "currency": "<string>",
        "value": "<string>"
      },
      "purchaseAmount": {
        "currency": "<string>",
        "value": "<string>"
      },
      "purchaseCurrency": "<string>",
      "purchaseNetwork": "<string>",
      "status": "ONRAMP_TRANSACTION_STATUS_CREATED",
      "transactionId": "<string>",
      "txHash": "<string>",
      "type": "ONRAMP_TRANSACTION_TYPE_BUY_AND_SEND",
      "userId": "<string>",
      "userType": "USER_TYPE_AUTHED",
      "walletAddress": "<string>"
    }
  ]
}