Add a new provider module for LAVA Business (api.lava.ru):
- invoice creation via POST /business/invoice/create signed with
HMAC-SHA256 over the raw request body in the Signature header
- webhook handling with Authorization-header signature verification
that accepts both raw-body and sorted-keys JSON canonicalizations
(legacy PHP SDK shops sign the latter), plus amount cross-check
before finalizing a successful payment
- pending invoice reuse through /business/invoice/status
- Telegram pay_lava callback flow and Web App payment creation
- admin settings manifest fields, presentation overrides, and
RUB-only currency support declared on the provider SPEC
Register the SPEC in the provider registry and wire the provider into
the payment method order, success-email labels, and locale override
prefixes.
Keep privacy policy and user agreement links as the supported legal documents.
Refresh the admin settings manifest, demo dataset, locales, docs, and bot menu tests.
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