postfix

The postfix operation puts a value at the end of the existing one. The original is kept, it just gains something after it.

How it works

You type the postfix in the operation settings and it is placed at the end of the value.

Value:  100    Postfix: USD     Result: 100USD
Value:  50     Postfix: kg      Result: 50kg
Value:  user   Postfix: -01     Result: user-01

Nothing else changes. The operation does not look at what is already there.

Mind the space

The postfix is joined to the value exactly as you typed it, so if you want 100 USD rather than 100USD, the space goes at the start of the postfix.

Whether it belongs there depends on the other side. Check their documentation or an example payload rather than guessing, because both forms look equally reasonable in the editor.

It stops being a number

Adding text to a number makes the whole thing text. 100 was a number, 100USD is a string.

That is fine when the advertiser wants it that way, but it means any calculation has to happen first. Do the math and the rounding, then add the postfix as the last step.

It also means you should think twice before doing it at all. Most APIs want the amount and the currency as two separate fields, and an amount arriving as 100USD is a common reason a request is rejected. Add a unit only when their documentation actually asks for it.

Use a condition, or it happens every time

The operation does not check whether the postfix is already there. Run it twice, or on data that already carries the unit, and you get 100USDUSD.

Set the condition so the step only runs when the postfix is missing, for example does not end with it. See Condition Operators and Field value.

The same applies when the field can hold values from different sources, where some already carry the unit and some do not.

The common uses

• Currencies and units, where the advertiser expects them joined to the value: 100USD, 50kg, 3.5m.
• Identifiers and labels, such as -01, -A or -TEST, for values you want to tell apart later.

Keep whatever you choose consistent across the workspace. EUR in one integration and € in another turns into a reporting problem long before anyone notices.

The other direction

To add something at the beginning instead, use prefix. To build a value from several fields at once, write them together in the field, as {amount} {currency}, rather than chaining postfixes.

Settings

The operation takes one parameter: the text to put at the end. Everything else is the source and the condition.