This article covers Step 4Q of the accounting integration setup: configuring the Cash Sale Customer and Internal Service Customer control accounts. These settings tell Blackpurl which customer accounts in your accounting package to use when posting cash sale and internal service transactions.
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For the full setup sequence, see Accounting Integration Setup: All Steps.
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The Cash Sale Customer and Internal Service Customer control accounts are customer records in your accounting package that Blackpurl uses to post transactions that don't belong to a named customer — for example, over-the-counter cash sales and internal work orders. You need to create these customer records in your accounting package first, then enter their IDs into Blackpurl.
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Before configuring these fields in Blackpurl, create two customer accounts in your accounting package if they don't already exist. Use these names:

Once created, you'll need the customer account ID for each one. The steps below explain how to find these IDs.
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Your accounting package stores a unique ID for each customer record. The easiest way to find it is to open the customer record and look at the URL in your browser — the ID appears in the address bar.
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Open the Cash Sale Customer or Internal Service Customer record in QuickBooks Online. The browser URL contains the customer ID number you need.
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Open the Cash Sale Customer or Internal Service Customer record in Xero. The browser URL contains the customer ID — it appears as a long alphanumeric string after /Contacts/View/.
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Once you have the customer ID from your accounting package, copy and paste it into the corresponding field in Blackpurl's accounting integration configuration screen.
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1. Open the accounting integration configuration screen in Blackpurl.
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2. Locate the Cash Sale Customer field and paste in the customer ID from your accounting package.
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3. Locate the Internal Service Customer field and paste in the customer ID from your accounting package.
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4. Save the configuration.
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Complete this process for both fields — Blackpurl requires a valid customer account ID in each one before the integration will post these transaction types correctly.
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