WC Vendors - Removes paypalap on checkout page if vendor hasnt entered their PayPal email on their Dashboard.

functions.php

/* WC Vendors - Looks at the cart and, if something in the cart is sold by a vendor who hasn’t saved
 * his PayPal account address in his Dashboard>Settings>Payment area, then the PayPal AP gateway included
 * with WC Vendors is removed from the list of available gateways at checkout.
 * Props to @dvrcthewrld for the code
*/

function ps_filter_gateways($gateways) {
    if ( is_checkout_pay_page() ) {
        global $wp;
        if ( isset( $wp->query_vars['order-pay'] ) ) {
            $order_id = $wp->query_vars['order-pay'];
            $order = wc_get_order($order_id);
            if ($order) {
                $order_items = $order->get_items('line_item');
                if ( ! empty( $order_items ) ) {
                    foreach ($order_items as $order_item) {
                        $productid = $order_item[ 'product_id' ];
                        $vendor = get_post_field( 'post_author', $post_id );
                        if ( ! empty($vendor) ) {
                            $ppaddress = get_user_meta( $vendor, 'pv_paypal', true );
                            if (empty($ppaddress)) {
                                if (isset( $gateways['paypalap'] )) {
                                    unset( $gateways['paypalap'] );
                                    break;
                                }
                            }
                        }
                    }
                }
            }
        }

    } else {
        $cart_contents = WC()->cart->get_cart();
        if ( ! empty( $cart_contents ) ) {
            foreach ( $cart_contents as $cart_item_key => $cart_item_data ) {
                $product = $cart_item_data[ 'data' ];
                $productid = $product->id;
                $vendor = get_post_field( 'post_author', $productid );
                if ( ! empty($vendor) ) {
                    $ppaddress = get_user_meta( $vendor, 'pv_paypal', true );
                    if (empty($ppaddress)) {
                        if (isset( $gateways['paypalap'] )) {
                            unset( $gateways['paypalap'] );
                            break;
                        }
                    }
                }
            }
        }
    }
    return $gateways;
}
add_filter('woocommerce_available_payment_gateways','ps_filter_gateways');