Hooks & REST API - Yeti Bookings Documentation

Actions

Hook	Arguments
`ybk_booking_created`	`$booking_id`
`ybk_booking_status_changed`	`$booking_id, $old_status, $new_status`
`ybk_booking_rescheduled`	`$booking_id, $old_start_timestamp`
`ybk_balance_order_created`	`$booking_id, $order_id`
`ybk_product_saved`	`$product_id, $config`

Filters

Hook	Use
`ybk_quote`	Change a price: `( $quote, $product_id, $start, $args )`. `$quote` has `total`, `deposit`, `balance` and `lines`.
`ybk_admin_email`	Change who receives admin emails
`ybk_send_email`	Return false to stop an email: `( $send, $to, $subject, $booking )`
`ybk_max_cart_bookings`	Most bookings one cart can hold at once (default 10)
`ybk_holds_per_hour`	Most new holds one IP address can make in an hour (default 20)
`ybk_guest_holds`	Most live holds visitors who aren't logged in can have across the whole site at once (default 50, 0 turns it off)

// 10% off bookings made by logged-in members.
add_filter( 'ybk_quote', function ( $quote ) {
    if ( is_user_logged_in() ) {
        $quote['total']   = round( $quote['total'] * 0.9, 2 );
        $quote['deposit'] = min( $quote['deposit'], $quote['total'] );
        $quote['balance'] = $quote['total'] - $quote['deposit'];
    }
    return $quote;
} );

REST API

Namespace yeti-bookings/v1. Booking options are passed as ybk_blocks, ybk_resource, ybk_persons[type] and ybk_extras[].

Route	Returns
`GET /products/{id}/month?month=2026-11`	Each day: available, full or closed
`GET /products/{id}/slots?date=2026-11-03`	Start times with spaces left
`GET /products/{id}/quote?ybk_start=TIMESTAMP`	Price, deposit and balance
`POST /bookings/{id}/reschedule`	Moves the logged-in customer's booking
`GET /admin/bookings?from=&to=`	Calendar data (shop managers only)

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