Mirrors the TS SDK 0.2.0 changes (cf c3a57a0 in keysat-client-ts) so
all four language clients have parity on the tiered-purchase surface.
Breaking change on start_purchase: positional `(buyer_email,
redirect_url)` args replaced with a `&StartPurchaseOptions` struct.
Migration is mechanical:
// before
client.start_purchase(slug, None, None).await?;
// after
client.start_purchase(slug, &Default::default()).await?;
// tier-aware
client.start_purchase(slug, &StartPurchaseOptions {
policy_slug: Some("pro"),
buyer_email: Some("buyer@example.com"),
..Default::default()
}).await?;
The struct has fields for buyer_email, buyer_note, redirect_url,
code, and the new policy_slug. New `list_public_policies` method
fetches the buyer-visible tier list (no auth) so an in-app tier
picker can render dynamically.
Lib + tests build clean; the example's anyhow-not-in-deps issue is
pre-existing and unrelated.
Keysat