Autopay api logic prototype.

ns_app/public/js/sales_invoice.js

@@ -0,0 +1,68 @@
+frappe.ui.form.on("Sales Invoice", {
+    refresh(frm) {
+        if (frm.doc.docstatus !== 1) return; // submitted only
+
+        frm.add_custom_button("Run Payment", () => {
+            run_payment_flow(frm);
+        });
+    }
+});
+
+function run_payment_flow(frm) {
+    frappe.call({
+        method: "ns_app.api.payments.check_autopay",
+        args: {
+            customer: frm.doc.customer
+        },
+        callback(r) {
+            if (!r.message) return;
+
+            if (r.message.autopay_enabled) {
+                run_autopay(frm, r.message.autopay_id);
+            } else {
+                open_manual_payment_form(frm);
+            }
+        }
+    });
+
+
+function run_autopay(frm, autopay_id) {
+    frappe.confirm(
+        `Run AutoPay for $${frm.doc.grand_total}?`,
+        () => {
+            frappe.call({
+                method: "ns_app.api.payments.run_autopay_payment",
+                args: {
+                    invoice: frm.doc.name,
+                    autopay_id: autopay_id,
+                    amount: frm.doc.grand_total
+                },
+                callback(r) {
+                    frappe.msgprint(r.message || "Payment processed");
+                    frm.reload_doc();
+                }
+            });
+        }
+    );
+}
+
+
+function open_manual_payment_form(frm) {
+    const dialog = new frappe.ui.Dialog({
+        title: "Enter Payment",
+        fields: [
+            {
+                fieldtype: "HTML",
+                fieldname: "payment_form",
+                options: `<iframe
+                    src="https://payments.yourprovider.com/pay?invoice=${frm.doc.name}&amount=${frm.doc.grand_total}"
+                    style="width:100%;height:500px;border:none;"
+                ></iframe>`
+            }    
+        ]
+    });
+
+    dialog.show();
+}
+
+}