Billium

Create a new crypto payment invoice for the merchant and return it,

Fetch a single invoice by ID, including its current status,

List the merchant’s invoices with pagination and optional search.

Cancel an invoice that has not yet been paid. Returns the updated

Register a webhook endpoint that Billium will POST events to. Use

List all webhook endpoints configured for the merchant.

Update an existing webhook endpoint (URL, subscribed events, active

Permanently delete a webhook endpoint.

Send a test event to a webhook endpoint to verify it is reachable

List the merchant’s customers (auto-created from invoices) with

Fetch a single customer by ID, including derived location when known.

Get a customer’s aggregate spend and invoice stats: total revenue

Update a customer’s name, address, or phone number. Email cannot be

Create a product the merchant can sell through a hosted checkout

Fetch a single product by ID (with a presigned image URL).

List the merchant’s products with pagination and optional search.

Update a product. Only the fields you pass are changed.

Delete a product.

List the merchant’s crypto wallet configurations (DIRECT_WALLET /

Fetch a single wallet configuration by ID.

Add a receiving wallet for a (cryptocurrency, network) pair. Pass

Update a wallet’s mutable config (address, xpub, enabled state,

Delete a wallet. Rejected if it still has active payments against it.