Dokan Multi-Vendor Marketplace Development for a B2B Industrial-Parts Store

add_filter( 'dokan_get_seller_percentage', function ( $percentage, $seller_id, $product_id, $category_id ) {
    $tier = get_user_meta( $seller_id, '_vendor_tier', true ) ?: 'standard';
    $tiers = [ 'standard' => 90, 'silver' => 92, 'gold' => 94 ]; // vendor keeps %
    $base  = $tiers[ $tier ] ?? 90;

    // Low-margin category override
    if ( in_array( (int) $category_id, [ 41, 42 ], true ) ) {
        $base -= 3;
    }

    return max( 0, min( 100, $base ) );
}, 10, 4 );

Commission is a business rule, not a number — keep it in one filter with a test matrix.

add_filter( 'dokan_withdraw_request_validation_errors', function ( $errors, $seller_id, $amount ) {
    $withdrawable = dokan_get_seller_withdrawable_balance( $seller_id ); // completed only
    $pending      = dokan_get_seller_balance( $seller_id, false ) - $withdrawable;

    if ( $amount > $withdrawable ) {
        $errors[] = sprintf(
            __( 'Only completed-order funds are withdrawable. Pending: %s', 'my-textdomain' ),
            wc_price( $pending )
        );
    }

    return $errors;
}, 10, 3 );

The hook name varies by Dokan version — verify against the installed version and guard with function_exists.

add_action( 'before_woocommerce_init', function () {
    if ( class_exists( \Automattic\WooCommerce\Utilities\FeaturesUtil::class ) ) {
        \Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility(
            'custom_order_tables', __FILE__, true
        );
    }
} );

Skip this and your plugin silently breaks the day the client enables High-Performance Order Storage.