PayPal Checkout Sandbox – "The payment request was refused by PayPal" on iPhone

https://www.fidelebrueder.de/index.php?option=com_hikashop&ctrl=checkout&task=notify&notif_payment=paypalcheckout&order_id=236&tmpl=component&lang=de&order_token=99HHF2iq&Itemid=101&createorder=1[/code
]

On iPhone (iOS) the browser reports:
[code]Fetch-Error -> Load failed

{"errorTitle":"An error has occurred","errorMessage":"","error":false,"id":"7G661998VS570111E"}

// iPhone Debug-Helfer – in Astroid > Custom JavaScript einfügen (ohne <script>-Tags)
(function () {
    var DEBUG_ACTIVE = true; // Zum Deaktivieren einfach auf false setzen

    // Nur auf iOS (iPhone/iPad/iPod) aktivieren
    var isIOS = /iP(hone|ad|od)/.test(navigator.userAgent || "");
    if (!DEBUG_ACTIVE || !isIOS) {
        return;
    }

    // Einfaches Overlay für Logs
    function createDebugOverlay() {
        if (document.getElementById("ios-debug-overlay")) return;

        var overlay = document.createElement("div");
        overlay.id = "ios-debug-overlay";
        overlay.style.position = "fixed";
        overlay.style.left = "0";
        overlay.style.right = "0";
        overlay.style.bottom = "0";
        overlay.style.maxHeight = "40%";
        overlay.style.background = "rgba(0,0,0,0.85)";
        overlay.style.color = "#0f0";
        overlay.style.fontSize = "10px";
        overlay.style.fontFamily = "monospace";
        overlay.style.zIndex = "999999";
        overlay.style.padding = "4px 6px 18px 6px";
        overlay.style.overflowY = "auto";

        var header = document.createElement("div");
        header.textContent = "iOS Debug-Konsole (Tippen zum Ein-/Ausklappen)";
        header.style.fontWeight = "bold";
        header.style.marginBottom = "2px";
        header.style.cursor = "pointer";
        header.style.color = "#fff";

        var content = document.createElement("div");
        content.id = "ios-debug-content";

        header.addEventListener("click", function () {
            if (content.style.display === "none") {
                content.style.display = "block";
            } else {
                content.style.display = "none";
            }
        });

        overlay.appendChild(header);
        overlay.appendChild(content);
        document.body.appendChild(overlay);
    }

    function logToOverlay(message) {
        try {
            createDebugOverlay();
            var content = document.getElementById("ios-debug-content");
            if (!content) return;

            var line = document.createElement("div");
            line.textContent = new Date().toISOString().slice(11, 19) + " " + message;
            content.appendChild(line);
            content.scrollTop = content.scrollHeight;
        } catch (e) {
            // falls Overlay selbst crasht, nichts tun
        }
    }

    var firstAlertShown = false;
    function notify(message) {
        logToOverlay(message);
        if (!firstAlertShown) {
            firstAlertShown = true;
            try {
                alert("iPhone JS-Fehler/Debug:\n\n" + message);
            } catch (e) { }
        }
    }

    // 1) Normale JavaScript-Fehler
    window.onerror = function (msg, url, line, col, error) {
        var text = "[Error] " + msg +
            " @ " + (url || "") +
            ":" + (line || "?") +
            (col != null ? ":" + col : "");

        if (error && error.stack) {
            text += " | Stack: " + error.stack.split("\n")[0];
        }
        notify(text);
        // return false = normal weiter behandeln
        return false;
    };

    // 2) Promise-Fehler (async/await etc.)
    window.onunhandledrejection = function (event) {
        var reason = event.reason;
        var msg = "[Promise-Rejection] ";
        if (reason && reason.message) {
            msg += reason.message;
        } else {
            msg += String(reason);
        }
        notify(msg);
    };

    // 3) fetch()-Fehler protokollieren
    if (window.fetch) {
        var originalFetch = window.fetch;
        window.fetch = function () {
            var args = arguments;
            return originalFetch.apply(this, args).catch(function (err) {
                notify("[Fetch-Error] " + (err && err.message ? err.message : err));
                throw err;
            });
        };
    }

    // 4) XHR-Fehler protokollieren (z.B. Ajax-Requests von HikaShop)
    if (window.XMLHttpRequest) {
        var originalOpen = XMLHttpRequest.prototype.open;
        var originalSend = XMLHttpRequest.prototype.send;

        XMLHttpRequest.prototype.open = function (method, url) {
            this._debugUrl = url;
            this._debugMethod = method;
            return originalOpen.apply(this, arguments);
        };

        XMLHttpRequest.prototype.send = function () {
            var xhr = this;
            xhr.addEventListener("error", function () {
                notify("[XHR-Error] " + (xhr._debugMethod || "") + " " + (xhr._debugUrl || ""));
            });
            xhr.addEventListener("load", function () {
                if (xhr.status >= 400) {
                    notify("[XHR-HTTP " + xhr.status + "] " + (xhr._debugMethod || "") + " " + (xhr._debugUrl || ""));
                }
            });
            return originalSend.apply(this, arguments);
        };
    }

    // 5) Simple Navigation-Infos (kann helfen bei Weiterleitungs-Problemen)
    (function () {
        var origPushState = history.pushState;
        if (origPushState) {
            history.pushState = function (state, title, url) {
                logToOverlay("[Navigation] pushState → " + url);
                return origPushState.apply(this, arguments);
            };
        }
        window.addEventListener("hashchange", function () {
            logToOverlay("[Navigation] hashchange → " + location.href);
        });
    })();

    logToOverlay("iOS-Debug aktiv – UserAgent: " + navigator.userAgent);
})();

...?task=notify&notif_payment=paypalcheckout&order_id=...

Fetch-Error -> Load failed