Your receipt email lists one product. Here’s the block that fixes it.

Three products in the order. One line in the email.

It isn’t a bug. Your template has one row in it, and a row is a row. It will faithfully render that one row for the rest of its life.

The fix is one block. Not one more step.

First, the instinct to ignore

If you’ve been following the Iterator series, you already know how to loop something: Iterator, Iterator Storage, Iterator End, and a separate run of the workflow for every item in the array.

Don’t add them here.

Nothing in this workflow needs to be pulled apart and run again. You aren’t creating a row per product in a spreadsheet, or calling an API per product. You’re printing a list. The array is already an array — and the template can read it.

The loop lives in the template

Open the email template and go to the Data tab. This is Dynamic Data — a plain JSON object that describes the shape of what you’re going to send in.

{
  "customer_name": "Amelia Okafor",
  "order_number": "1043",
  "order_total": "105.00",
  "line_items": [
    { "name": "Ceramic Mug",
      "quantity": 2, "total": "25.00" },
    { "name": "Cold Brew Kit",
      "quantity": 1, "total": "48.00" },
    { "name": "Linen Tote",
      "quantity": 1, "total": "32.00" }
  ]
}

Two things matter here. These keys become the fields you map later — and one of them is an array.

Add a block, and take the last one

Heading, Text, Button, Image, Avatar, Divider, Spacer, Html, Columns, Container… and Loop.

Two fields, and that’s the entire feature:

• Data Source — “The path to the array in your dynamic data”. Here, line_items.
• Loop Variable — “The variable name to use inside the loop”. Here, item.

Then you build one row inside it. A Columns block, three cells: {{item.name}}, {{item.quantity}}, {{item.total}}.

That’s the whole design job.

The bit that makes it obvious

Watch the label on the block: LOOP: line_items as item (3 items). It counts your array as you type.

The first row stays yours to edit. The other two fill themselves in from the data you pasted a minute ago, marked Preview Item 2 (Read-only) and Preview Item 3 (Read-only) — so they can’t drift away from the row you designed.

One row in the editor. Three rows in the email. Same block.

Watch it built

The template, the Loop block, the workflow and a full run — in under four minutes:

The workflow is two steps

WooCommerce → Order Paid. Then Email by FlowMattic → Send Template Email. That’s it.

Pick the template, and a Dynamic Data section appears underneath it. Look closely at the names: they’re the exact keys from the Data tab, and you can’t type in them. FlowMattic says so in the help text — “The fields here are defined in ‘Data’ tab in email template editor.”

The template owns the contract. The step just fills it.

customer_name   {woocommerce1.billing_first_name}
order_number    {woocommerce1.number}
order_total     {woocommerce1.total}
line_items      {woocommerce1.line_items}

The part that surprises people

WooCommerce hands line items over as JSON. One long escaped string, not an array. Every instinct says you now need a parser step.

Drop it in anyway.

Before the loop runs, FlowMattic passes your variables through a preparation pass that decodes any value that is valid JSON into a real array. By the time {% for item in line_items %} is evaluated, it’s looking at three objects — not at a string.

So there’s no JSON Parser step here. And no Iterator.

Which tool, and when

• Iterator — when the array has to become separate runs, with a step of its own for every item. A row per product in Google Sheets. An API call per record.
• Loop block — when it only has to become rows inside an email. The template already knows how.

Reach for the wrong one and everything still works — it’s just three steps and N workflow runs where one block would have done.

One block. Two fields.

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