Ofish

[dusky lion]

https://stripe.com/docs/api/metadata Have you tried this AddMetadata?

or try this

params := &stripe.SubscriptionItemParams{
  //...
  Params: stripe.Params{
    Metadata: map[string]string{
      "key": "value",
    },
  },
}```

From here https://github.com/stripe/stripe-go/pull/1468