Either party in a case may apply for a subpoena for records
In the court case, either the plaintiff or the defendant can issue a valid subpoena for records and documents. There is no limit to the number of such requests you might make. The court will have a schedule on the civil case, but if you comply with the scheduling rules either party has access to use the subpoena process.
Use an authorized subpoena
Once signed by the Court, the document subpoena will direct someone to produce a receipt, bill, invoice or other document in her or his possession or under her or his control. A document can be any written information that proves a fact, such as a contract, a bank statement, or an estimate.
Service of a subpoena for records
The person who serves the subpoena must complete an Affidavit of Service so there is a record of the date it was served. Serving the subpoena can be done by the local authorities, a subpoena service or even by a private investigator.
What documents to seek
Ask for only what you need to prove your case. Avoid paying to have documents produced to the court that may be irrelevant and unhelpful. If you narrow the scope of your request you will have an easier time getting the required compliance on the subpoena.