Creating the webhook fails | WordPress.org

Hi @mrclayton.

Thank you for your work of providing an alternative PayPal plugin for WooCommerce. I’m just trying to figure out if it works for me.

I have made the setting for the sandbox and get “Status: Connected” with a green check mark.

When I try to create the webhook I get the message Invalid data provided. The log files has the following information:

2023-11-21T18:59:15+00:00 ERROR API error: Array
(
    [url] => https://api-m.sandbox.paypal.com/v1/notifications/webhooks
    [method] => POST
    [http_status] => 400
    [request] => Array
(
    [url] => http://sandbox.domain.tld/wp-json/wc-ppcp/v1/webhook/sandbox
    [event_types] => Array
        (
            [0] => Array
                (
                    [name] => PAYMENT.CAPTURE.COMPLETED
                )

            [1] => Array
                (
                    [name] => PAYMENT.CAPTURE.DENIED
                )

            [2] => Array
                (
                    [name] => PAYMENT.CAPTURE.REFUNDED
                )

            [3] => Array
                (
                    [name] => CHECKOUT.ORDER.APPROVED
                )

            [4] => Array
                (
                    [name] => CHECKOUT.ORDER.PROCESSED
                )

            [5] => Array
                (
                    [name] => CUSTOMER.DISPUTE.CREATED
                )

            [6] => Array
                (
                    [name] => CUSTOMER.DISPUTE.RESOLVED
                )

        )

)

    [error] => Array
        (
            [name] => VALIDATION_ERROR
            [message] => Invalid data provided
            [debug_id] => 44120256007c5
            [information_link] => https://developer.paypal.com/docs/api/webhooks/#errors
            [details] => Array
                (
                    [0] => Array
                        (
                            [field] => url
                            [location] => body
                            [issue] => Not a valid webhook URL
                        )

                )

            [links] => Array
                (
                )

        )

)

When I open the URL http://sandbox.domain.tld/wp-json/wc-ppcp/v1/webhook/sandbox in my browser I get

{
    "code": "rest_no_route",
    "message": "No route was found matching the URL and request method.",
    "data": {
        "status": 404
    }
}

Would you mind telling me what I might have done wrong?

Thank you in advance!