The chosen recording rule might credit the first visit, the last qualifying interaction or a tracked signup source. Different rules can assign different credit to the same journey. (Ghost member sources documentation ↗)
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Separating recorded source from cause
A Ghost signup record credits a partner link as the source of a new member’s signup. If that member later pays, record payment as a separate event; the signup-source field does not by itself say why the person paid.
A source field is not a causal test
One purchase can follow several interactions. Preserve the journey without counting each source credit as another purchase. A recorded source is useful for description; establishing that a channel caused the sale requires a different comparison.
Keep observed credit separate from a causal claim
If someone joins from a partner link and later pays after receiving your newsletter, keep both events. A source report can assign credit under a chosen rule. To decide whether spending more on the partner would produce additional sales, you need a separate comparison.