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When a user builds a custom plan by picking individual features, the receipt metadata contains the feature details directly.

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How metadata is stored

Stripe limits metadata values to 500 characters. Cuprice splits the feature JSON across multiple keys: 
{
  "customPlan": "true",
  "featureDetails_0": "[{\"name\":\"AI Prompt\",\"type\":\"Standard\",\"price\":10},",
  "featureDetails_1": "{\"name\":\"Dashboard\",\"type\":\"Standard\",\"price\":20}]"
}

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Reconstructing the feature list

Join all featureDetails_* keys and parse the JSON: 
const metadata = receipt.metadata;

let json = "";
Object.keys(metadata)
  .filter(k => k.startsWith("featureDetails"))
  .sort()
  .forEach(k => json += metadata[k]);

const features = JSON.parse(json);
// => [{ name: "AI Prompt", type: "Standard", price: 10 }, ...]

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Feature object shape

Each feature in the array has:
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name
string
required
Feature name (e.g. “AI Prompt”)
​
type
string
required
Feature type: “Standard”, “Limits”, or “Usage Based”
​
price
number
required
Price for this feature
​
quantity
number
For Limits/Usage Based features, the purchased quantity