Create and send invoices with the Billing API

Invoicing is Meow’s accounts-receivable surface. You define the products you sell and the customers you bill, then combine them into an invoice, with its line items, due date, the payment methods you’ll accept, and the account that collects the money. Meow emails the invoice to the customer on its invoice date and tracks it through to paid.

Only bank transfer is enabled by default. Card, ACH direct debit, and USDC payment methods must be turned on for your business before you can add them to an invoice. Test the whole flow in the sandbox before going live.

You’ll need

An API key with the billing scopes for the resources you touch:
- billing:products:read / billing:products:write for products
- billing:customers:read / billing:customers:write for customers
- billing:invoices:read / billing:invoices:write for invoices
- billing:accounts:read to list collection accounts

1. Create or find a product

A product is a reusable good or service with a default price. List what you already have. GET /billing/products returns a bare array:

curl https://api.meow.com/v1/billing/products -H "x-api-key: $MEOW_API_KEY"

Response

[
  { "id": "prod_9f8e7d6c", "name": "Catnip Consulting", "description": "Advisory retainer", "default_price": "150.00" }
]

Create a new one when you need it:

curl -X POST https://api.meow.com/v1/billing/products \
  -H "x-api-key: $MEOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "name": "Catnip Consulting", "description": "Advisory retainer, billed hourly", "default_price": 150.00 }'

Response

{ "id": "prod_9f8e7d6c", "name": "Catnip Consulting", "description": "Advisory retainer, billed hourly", "default_price": "150.00" }

Save the product id. You will reference it from each invoice line item.

2. Create or find a customer

A customer is who you invoice. POST /billing/customers needs a nickname and email; an address is optional but appears on the invoice when present.

curl -X POST https://api.meow.com/v1/billing/customers \
  -H "x-api-key: $MEOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "nickname": "Purrfect Partners",
    "email": "billing@purrfectpartners.com",
    "address": {
      "street_line_1": "9 Whisker Way",
      "street_line_2": "Suite 200",
      "city": "San Francisco",
      "state": "CA",
      "postal_code": "94105",
      "country": "US"
    }
  }'

Response

{
  "id": "cust_4a5b6c7d",
  "nickname": "Purrfect Partners",
  "email": "billing@purrfectpartners.com",
  "address": { "street_line_1": "9 Whisker Way", "street_line_2": "Suite 200", "city": "San Francisco", "state": "CA", "postal_code": "94105", "country": "US" },
  "created_time": "2026-06-30T10:30:00.000Z",
  "updated_time": null
}

Save the customer id for the invoice. GET /billing/customers lists your existing customers as a bare array.

3. Choose the payment methods

Check which payment methods are enabled for your business. The response lists them under allowed_types:

curl https://api.meow.com/v1/billing/payment-method-types -H "x-api-key: $MEOW_API_KEY"

Response

{ "allowed_types": ["BANK_TRANSFER", "CARD", "ACH_DIRECT_DEBIT"] }

BANK_TRANSFER is always available. CARD, ACH_DIRECT_DEBIT, INTERNATIONAL_WIRE, and the USDC/USDT variants only appear once enabled for your business. Card and ACH direct debit also require customer consent to charge.

4. Pick a collection account

Collection accounts are where invoice payments land. List the accounts available to receive funds:

curl https://api.meow.com/v1/billing/accounts -H "x-api-key: $MEOW_API_KEY"

Response

{
  "accounts": [
    { "id": "acct_1a2b3c4d", "display_name": "Primary Operating Account", "account_number_mask": "••1234", "status": "open", "is_primary": true, "banking_product": "GRASSHOPPER" }
  ]
}

Use the account id as collection_account_id on the invoice.

5. Create the invoice

Combine the pieces into an invoice. Each line item points at a product_id and a quantity; omit price or description to inherit the product’s defaults, and add a discount_percentage for a per-line discount.

curl -X POST https://api.meow.com/v1/billing/invoices \
  -H "x-api-key: $MEOW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "customer_id": "cust_4a5b6c7d",
    "line_items": [
      {
        "product_id": "prod_9f8e7d6c",
        "quantity": 10,
        "price": 150.00,
        "description": "10 hours of advisory work",
        "discount_percentage": 10,
        "discount_description": "Early-payment discount"
      }
    ],
    "invoice_date": "2026-06-30",
    "due_date": "2026-07-30",
    "payment_method_types": ["BANK_TRANSFER", "CARD"],
    "send_email_on_creation": true,
    "additional_recipient_emails": ["ap@purrfectpartners.com"],
    "note": "Thanks for your business!",
    "name": "INV-2026-001",
    "collection_account_id": "acct_1a2b3c4d",
    "show_contact_address": true
  }'

Response

{
  "id": "inv_7c8d9e0f",
  "name": "INV-2026-001",
  "customer_id": "cust_4a5b6c7d",
  "status": "Open",
  "amount": "1350.00",
  "amount_paid": "0.00",
  "amount_due": "1350.00",
  "line_item_ids": ["line_2b3c4d5e"],
  "invoice_date": "2026-06-30",
  "due_date": "2026-07-30",
  "payment_method_types": ["BANK_TRANSFER", "CARD"],
  "collection_account_id": "acct_1a2b3c4d",
  "created_at": "2026-06-30T10:30:00.000Z",
  "sent_at": "2026-06-30T10:30:01.000Z"
}

Field	Description
`customer_id`	Required. The customer being invoiced.
`line_items`	Required. Each references a `product_id` and `quantity`; `price`/`description` default to the product, and `discount_percentage` applies a per-line discount.
`invoice_date` / `due_date`	Required. The date the invoice is scheduled to be sent and the date payment is due (`YYYY-MM-DD`).
`payment_method_types`	Required. The methods to accept, a subset of `allowed_types`.
`send_email_on_creation`	Required. Whether to email the customer (and `additional_recipient_emails`) on the `invoice_date`. Despite the name, the email is sent on `invoice_date`, not at create time.
`collection_account_id`	Required. The account that collects payment.
`additional_recipient_emails`	Extra addresses to copy on the invoice and its receipts.
`recurring_schedule`	An RFC 2445 RRULE to send the invoice on a repeating schedule.

Use today’s invoice_date to send the invoice now, or a future date to schedule it. The invoice stays Scheduled and the email goes out on the invoice_date.

6. Send invoices on a recurring schedule

For subscriptions or retainers, pass a recurring_schedule as an RFC 2445 RRULE when you create the invoice, and Meow issues each occurrence on schedule.

{ "recurring_schedule": "FREQ=MONTHLY;INTERVAL=1;BYMONTHDAY=1" }

A tool like the RRULE generator makes it easy to build and preview the schedule string.

7. Retrieve and track invoices

Fetch one invoice with GET /billing/invoices/{invoice_id}, list them all with GET /billing/invoices (a bare array), or download the PDF from GET /billing/invoices/{invoice_id}/download. Each invoice reports its status alongside amount, amount_paid, and amount_due:

`status`	Meaning
`Draft`	Created but not yet sent.
`Open`	Sent and awaiting payment.
`Pending`	A payment is in progress.
`Scheduled`	Queued to send on a recurring schedule.
`Partially Paid`	Some, but not all, of the balance is paid.
`Paid`	Paid in full; see `paid_at`.
`Overdue`	Past `due_date` and still unpaid.
`Canceled` / `Expired`	Voided or lapsed before payment.

End to end

# 1. Create a product and capture its id.
PRODUCT_ID=$(curl -s -X POST https://api.meow.com/v1/billing/products \
  -H "x-api-key: $MEOW_API_KEY" -H "Content-Type: application/json" \
  -d '{"name":"Website Build","description":"Custom website development","default_price":5000.00}' \
  | jq -r .id)

# 2. Create the customer.
CUSTOMER_ID=$(curl -s -X POST https://api.meow.com/v1/billing/customers \
  -H "x-api-key: $MEOW_API_KEY" -H "Content-Type: application/json" \
  -d '{"nickname":"Purrfect Partners","email":"billing@purrfectpartners.com"}' \
  | jq -r .id)

# 3. Pick the first available collection account.
ACCOUNT_ID=$(curl -s https://api.meow.com/v1/billing/accounts \
  -H "x-api-key: $MEOW_API_KEY" | jq -r '.accounts[0].id')

# 4. Create and send the invoice.
curl -s -X POST https://api.meow.com/v1/billing/invoices \
  -H "x-api-key: $MEOW_API_KEY" -H "Content-Type: application/json" \
  -d "{
    \"customer_id\": \"$CUSTOMER_ID\",
    \"line_items\": [ { \"product_id\": \"$PRODUCT_ID\", \"quantity\": 1, \"description\": \"Website build - phase 1\" } ],
    \"invoice_date\": \"$(date +%Y-%m-%d)\",
    \"due_date\": \"$(date -v+30d +%Y-%m-%d 2>/dev/null || date -d '+30 days' +%Y-%m-%d)\",
    \"payment_method_types\": [\"BANK_TRANSFER\"],
    \"send_email_on_creation\": true,
    \"collection_account_id\": \"$ACCOUNT_ID\"
  }" | jq '{ id, status, amount_due }'

Create a product

Full request contract for POST /billing/products.

Create a customer

Create an invoice

Line items, discounts, payment methods, and scheduling.

List collection accounts

The accounts that can receive invoice payments.

Get Started

MCP Server

Tutorials

Create and send invoices with the Billing API

You’ll need

1. Create or find a product

2. Create or find a customer

3. Choose the payment methods

4. Pick a collection account

5. Create the invoice

6. Send invoices on a recurring schedule

7. Retrieve and track invoices

End to end

See also

Create a product

Create a customer

Create an invoice

List collection accounts

​You’ll need

​1. Create or find a product

​2. Create or find a customer

​3. Choose the payment methods

​4. Pick a collection account

​5. Create the invoice

​6. Send invoices on a recurring schedule

​7. Retrieve and track invoices

​End to end

​See also

Create a product

Create a customer

Create an invoice

List collection accounts

You’ll need

1. Create or find a product

2. Create or find a customer

3. Choose the payment methods

4. Pick a collection account

5. Create the invoice

6. Send invoices on a recurring schedule

7. Retrieve and track invoices

End to end

See also