> ## Documentation Index > Fetch the complete documentation index at: https://docs.meld.io/llms.txt > Use this file to discover all available pages before exploring further. # For All Products > This section applies to all Meld crypto products This section is for developers integrating any of Meld's three crypto products (White-Label API, Meld Checkout, or Virtual Account). The pages here cover the cross-cutting concepts — webhooks, transaction statuses, sandbox testing, and provider onboarding — you'll need regardless of which product you picked. * **[Webhook events](/docs/stablecoins/for-all-products/webhook-events)** — the events Meld sends you when transactions are created and updated, with payload examples * **[Webhook authentication](/docs/stablecoins/for-all-products/webhooks-authentication)** — how to verify webhook signatures * **[Transaction statuses](/docs/stablecoins/for-all-products/transaction-statuses)** — the full list of crypto transaction statuses and what each one means * **[Service-provider setup](/docs/stablecoins/for-all-products/service-provider-setup)** — how to add additional onramps for greater coverage and redundancy * **[Sandbox guide](/docs/stablecoins/sandbox-guide)** — test cards, wallets, KYC triggers, and provider-specific sandbox notes