Payments API

Use the Payments API to send revenue events from any payment provider and attribute them to visitors.

DataFast can track payments automatically when you connect a payment provider such as Stripe, LemonSqueezy, Polar, Paddle, Shopify, or WooCommerce. Use this API endpoint for custom payment flows or providers that DataFast does not integrate with yet.

Endpoint	Method	Path	Purpose
Create payment	POST	`/api/v1/payments`	Record a payment or revenue event
Delete payments	DELETE	`/api/v1/payments`	Delete payment events by transaction, visitor, or date range

Create a payment

POST https://datafa.st/api/v1/payments

Authentication

df_ website API key for one website. No websiteId query parameter required.
dft_ account token with payments:write. Pass websiteId as a query parameter.

Body parameters

Field	Type	Required	Description
`amount`	number	Yes	Payment amount. Must be zero or greater. Use `refunded: true` for refunds
`currency`	string	Yes	Payment currency code, for example `USD`
`transaction_id`	string	Yes	Unique transaction ID from your payment provider
`datafast_visitor_id`	string	No	Strongly recommended for revenue attribution
`email` / `customer_email`	string	No	Customer email
`name` / `customer_name`	string	No	Customer name
`customer_id`	string	No	Stable customer ID from your payment system
`renewal`	boolean	No	Set true for recurring renewal payments
`refunded`	boolean	No	Set true to record a refund
`is_free_trial`	boolean	No	Also inferred when `amount` is `0`
`timestamp`	string	No	ISO 8601 timestamp. Defaults to now

{
  "amount": 29.99,
  "currency": "USD",
  "transaction_id": "payment_456",
  "datafast_visitor_id": "visitor-id-from-cookie"
}

Delete payments

DELETE https://datafa.st/api/v1/payments

Delete by transaction_id, datafast_visitor_id, startAt, and endAt.

DELETE /api/v1/payments?transaction_id=payment_456
DELETE /api/v1/payments?datafast_visitor_id=visitor-id-from-cookie&startAt=2026-05-01T00:00:00Z&endAt=2026-05-19T23:59:59Z

Be careful: without a date range, matching records across all time can be deleted.

Response

Response fields

Field	Type	Description
`message`	string	Result message. This endpoint does not wrap successful create responses in `status: "success"`
`transaction_id`	string	Transaction ID that was recorded, attributed, skipped as duplicate, or refunded

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