I have got an stand out file that contains a listing of records by firstname, lastname, email_address, transaction_id

Let me produce a script that reads within the stand out data (could be csv or whatever export is simplest to utilize) and card inserts each record like a user during my wordpress database using the role of "member".

You are able to explode each line around the delimter (like ,) or you might use fopen and fgetcsv to parse line by line. Overall the overall procedure isn't difficult. for instance:

$fileResource = fopen('/path/to/file.csv', 'r');
while(($data = fgetcsv($fileResource, ',')) !== false)
{
   // $data is numeric indexed array
   // do stuff with $data
}