Custom Capacitor 6 plugin with SPM: "plugin is not implemented on ios" despite being compiled

[JUSTMUV]

Category: StoreKit / In-App Purchase

Hi everyone,

I'm building an iOS app using Capacitor 6 with Swift Package Manager (SPM). I have a custom native plugin (AppleIAPPlugin) for StoreKit 2 In-App Purchases that lives in the App target (not as an SPM package). Despite compiling successfully, the JavaScript bridge throws:

"AppleIAP" plugin is not implemented on ios

Setup
AppleIAPPlugin.swift:

swift
import Foundation
import Capacitor
import StoreKit

@objc(AppleIAPPlugin)
public class AppleIAPPlugin: CAPPlugin, CAPBridgedPlugin {
public let identifier = "AppleIAPPlugin"
public let jsName = "AppleIAP"
public let pluginMethods: [CAPPluginMethod] = [
CAPPluginMethod(name: "getProducts", returnType: CAPPluginReturnPromise),
CAPPluginMethod(name: "purchase", returnType: CAPPluginReturnPromise),
CAPPluginMethod(name: "restorePurchases", returnType: CAPPluginReturnPromise),
CAPPluginMethod(name: "getCurrentEntitlements", returnType: CAPPluginReturnPromise),
CAPPluginMethod(name: "openManageSubscriptions", returnType: CAPPluginReturnPromise),
]

@objc func getProducts(_ call: CAPPluginCall) { /* StoreKit 2 implementation */ }
@objc func purchase(_ call: CAPPluginCall) { /* ... */ }
// etc.

}
AppleIAPPlugin.m:

objc
#import <Foundation/Foundation.h>
#import <Capacitor/Capacitor.h>

CAP_PLUGIN(AppleIAPPlugin, "AppleIAP",
CAP_PLUGIN_METHOD(getProducts, CAPPluginReturnPromise);
CAP_PLUGIN_METHOD(purchase, CAPPluginReturnPromise);
CAP_PLUGIN_METHOD(restorePurchases, CAPPluginReturnPromise);
CAP_PLUGIN_METHOD(getCurrentEntitlements, CAPPluginReturnPromise);
CAP_PLUGIN_METHOD(openManageSubscriptions, CAPPluginReturnPromise);
)
MyBridgeViewController.swift (custom bridge to register the plugin):

swift
import UIKit
import Capacitor

class MyBridgeViewController: CAPBridgeViewController {
override open func capacitorDidLoad() {
bridge?.registerPluginType(AppleIAPPlugin.self)
}
}
Main.storyboard points to MyBridgeViewController (module: App) instead of CAPBridgeViewController.

TypeScript side:

typescript
import { registerPlugin } from "@capacitor/core";
export const AppleIAP = registerPlugin("AppleIAP");
What I've verified
Both .swift and .m files are in the Xcode project's Compile Sources build phase
nm on the compiled binary confirms OBJC_CLASS_$_AppleIAPPlugin symbol exists
The build succeeds with zero errors
Other SPM-based Capacitor plugins (Share, Media, NativeAudio) work fine — they have pluginMethods and jsName symbols in the binary; my custom plugin does NOT
A bridging header (App-Bridging-Header.h) is configured with #import <Capacitor/Capacitor.h>
What I've tried (all failed)
.m file with CAP_PLUGIN macro only (no CAPBridgedPlugin in Swift)
Added CAPBridgedPlugin protocol conformance to Swift class
Created MyBridgeViewController subclass with registerPluginType() in capacitorDidLoad()
Removed/added override public func load() method
Added #import <Foundation/Foundation.h> to .m file
Various bridging header configurations
Multiple clean builds and derived data wipes
Environment
Xcode 16
Capacitor 6 (via SPM, binary xcframework)
iOS 17+ deployment target
Physical device testing (not simulator)
Question
How should a custom plugin in the App target be registered with Capacitor 6 when using SPM? The SPM-based plugins from node_modules get auto-discovered, but my custom plugin in the App target does not.

Is there a step I'm missing to make registerPluginType() work, or should I structure my custom plugin as a local SPM package instead?

Any guidance would be greatly appreciated.

[jcesarmobile]

You have to use registerPluginInstance, not registerPluginType.

https://capacitorjs.com/docs/v6/ios/custom-code#register-the-plugin

Also, you shouldn't be using the .m file anymore, the methods should be declared in the own .swift file and the plugin class should be a CAPBridgedPlugin instance. And the class should include a identifier and jsName.
That is also explained on the same page, different section

https://capacitorjs.com/docs/v6/ios/custom-code#echopluginswift

[JUSTMUV]

It worked!!! Thanks. Marry me.