4 * Payment sending methods now take an explicit `PaymentId`, which acts as an
5 idempotency token. You may use the PaymentHash for this, which existing
6 `InvoicePayer` send methods do, new `_with_id` variants were added (#XXXX).
7 * Pending outbound payments are no longer automatically timed-out a few blocks
8 after failure. Thus, in order to avoid leaking memory, you MUST call
9 `ChannelManager::abandon_payment` when you no longer wish to retry (#XXXX).
11 Serialization Compatibility
12 ===========================
14 * When downgrading to a version of LDK prior to THIS_VERSION_XXX when there are
15 resolved payments waiting for a small timeout, the payments may not be
16 removed, preventing payments with the same `PaymentId`.