Authorize.net API and XML to CSV

[LansoirThemos]

I'm working with the Authorize.net API in powershell to return some transaction data. The output is in XML and I need to get it into CSV. Here is what I'm needing it to do.

API : https://developer.authorize.net/api/reference/index.html /developerbook

1. Get batchId from data range ( getSettledBatchListRequest )

2. Get all transactionId from batchId ( getTransactionListRequest )

3. Get transaction details for each ( getTransactionDetailsRequest )

4. Take each transaction details response and create a csv file

5. Need some kind of error handling to insure all transactions that are called are wrote to the file

6. In each transaction details response i really only care about the following XML nodes: settleAmount, customer id, firstName, lastName, creditCard, bankAccount

7. Ideally i need two separate files, one for credit card and one for bank account but the challenge is I don't know what type it is until the transactionId is called again getTransactionDetailsRequest

Below is what I've got so far. I've having a bit of trouble with the variable inside of a single quote on the getTransactionDetailsRequest. Any help would be greatly appreciated:

EDIT: fixed the xml variables and then figured out the foreach issue. Now just need to get the foreach results to CSV

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

$url = "https://api.authorize.net/xml/v1/request.api"
$api_login_id = "api_login_id"
$transaction_key = "transaction_key"

$authorize_path = "C:\Users\Admin\Desktop\authorize"

$getSettledBatchListRequest_xml = @"
<getSettledBatchListRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd">
  <merchantAuthentication>
    <name>$api_login_id</name>
    <transactionKey>$transaction_key</transactionKey>
  </merchantAuthentication>
  <includeStatistics>true</includeStatistics>

  <firstSettlementDate>2018-08-01T00:00:00</firstSettlementDate>
  <lastSettlementDate>2018-08-01T23:59:59</lastSettlementDate>
</getSettledBatchListRequest>
"@

# Call for batchId on certain date range. Output XML and get batchId from XML
Invoke-RestMethod -Uri $url -Method Post -Body $getSettledBatchListRequest_xml -ContentType 'application/xml' -OutFile $authorize_path\getSettledBatchListRequest.xml
$getSettledBatchListRequest_results = Get-Content $authorize_path\getSettledBatchListRequest.xml
$batchid = ([xml]$getSettledBatchListRequest_results).getSettledBatchListResponse.batchList.batch.batchId


$getTransactionListRequest_xml = @"
<getTransactionListRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd">
    <merchantAuthentication>
        <name>$api_login_id</name>
        <transactionKey>$transaction_key</transactionKey>
    </merchantAuthentication>
    <batchId>$batchid</batchId>
    <sorting>
      <orderBy>submitTimeUTC</orderBy>
      <orderDescending>true</orderDescending>
    </sorting>
    <paging>
      <limit>1000</limit>
      <offset>1</offset>
    </paging>
</getTransactionListRequest>
"@


Invoke-RestMethod -Uri $url -Method Post -Body $getTransactionListRequest_xml -ContentType 'application/xml' -OutFile $authorize_path\getTransactionListRequest.xml
$getTransactionListRequest_results = Get-Content $authorize_path\getTransactionListRequest.xml
$transactionids = ([xml]$getTransactionListRequest_results).getTransactionListResponse.transactions.transaction.transId


$getTransactionDetailsRequest = @"
<getTransactionDetailsRequest xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd">
      <merchantAuthentication>
        <name>$api_login_id</name>
        <transactionKey>$transaction_key</transactionKey>
      </merchantAuthentication>
      <transId>$transactionid</transId>
</getTransactionDetailsRequest>
"@


$results = foreach ($transactionid in $transactionids) {
Invoke-RestMethod -Uri $url -Method Post -Body $getTransactionDetailsRequest -ContentType 'application/xml'
}

$results