diff --git a/MODULAR PRODUCTION-GRADE SDK b/MODULAR PRODUCTION-GRADE SDK
new file mode 100644
index 0000000..1cf173a
--- /dev/null
+++ b/MODULAR PRODUCTION-GRADE SDK	
@@ -0,0 +1,33 @@
+STRUKTUR FINAL (PRODUCTION SDK)
+
+pi-sdk-js-pro/
+├─ src/
+│  ├─ core/
+│  │  ├─ config.ts
+│  │  ├─ event-bus.ts
+│  │  ├─ payment-engine.ts
+│  │
+│  ├─ auth/
+│  │  └─ connect.ts
+│  │
+│  ├─ payment/
+│  │  └─ create-payment.ts
+│  │
+│  ├─ marketplace/
+│  │  └─ merchant.ts
+│  │
+│  ├─ plugins/
+│  │  └─ plugin.ts
+│  │
+│  ├─ audit/
+│  │  └─ audit-log.ts
+│  │
+│  ├─ types/
+│  │  └─ index.ts
+│  │
+│  ├─ sdk.ts
+│  └─ index.ts
+│
+├─ package.json
+├─ tsconfig.json
+└─ README.md
diff --git a/src/types/index.ts b/src/types/index.ts
new file mode 100644
index 0000000..cf4c1e4
--- /dev/null
+++ b/src/types/index.ts
@@ -0,0 +1,38 @@
+export type PiEnv = 'production' | 'sandbox' | 'mock'
+
+export interface PiUser {
+  uid: string
+  username: string
+  roles?: string[]
+}
+
+export type PaymentStatus =
+  | 'CREATED'
+  | 'APPROVED'
+  | 'SUBMITTED'
+  | 'COMPLETED'
+  | 'CANCELLED'
+  | 'FAILED'
+  | 'EXPIRED'
+
+export interface PaymentData {
+  amount: number
+  memo: string
+  metadata?: Record<string, any>
+}
+
+export interface SplitRule {
+  merchantId: string
+  amount: number
+}
+
+export interface MarketplacePayment extends PaymentData {
+  splits?: SplitRule[]
+  escrow?: boolean
+}
+
+export interface Merchant {
+  merchantId: string
+  wallet: string
+  feePercent?: number
+}
diff --git a/src/types/src/core/config.ts b/src/types/src/core/config.ts
new file mode 100644
index 0000000..884d0a4
--- /dev/null
+++ b/src/types/src/core/config.ts
@@ -0,0 +1,12 @@
+import { PiEnv } from '../types'
+
+export interface PiSdkConfig {
+  env?: PiEnv
+  appId?: string
+  debug?: boolean
+}
+
+export const defaultConfig: PiSdkConfig = {
+  env: 'production',
+  debug: false
+}
diff --git a/src/types/src/core/src/core/event-bus.ts b/src/types/src/core/src/core/event-bus.ts
new file mode 100644
index 0000000..fc47351
--- /dev/null
+++ b/src/types/src/core/src/core/event-bus.ts
@@ -0,0 +1,15 @@
+export type EventHandler = (payload?: any) => void
+
+export class EventBus {
+  private listeners = new Map<string, EventHandler[]>()
+
+  on(event: string, handler: EventHandler) {
+    const list = this.listeners.get(event) || []
+    list.push(handler)
+    this.listeners.set(event, list)
+  }
+
+  emit(event: string, payload?: any) {
+    this.listeners.get(event)?.forEach(h => h(payload))
+  }
+}
diff --git a/src/types/src/core/src/core/src/core/event-bus.ts b/src/types/src/core/src/core/src/core/event-bus.ts
new file mode 100644
index 0000000..fc47351
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/event-bus.ts
@@ -0,0 +1,15 @@
+export type EventHandler = (payload?: any) => void
+
+export class EventBus {
+  private listeners = new Map<string, EventHandler[]>()
+
+  on(event: string, handler: EventHandler) {
+    const list = this.listeners.get(event) || []
+    list.push(handler)
+    this.listeners.set(event, list)
+  }
+
+  emit(event: string, payload?: any) {
+    this.listeners.get(event)?.forEach(h => h(payload))
+  }
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/audit-log.ts b/src/types/src/core/src/core/src/core/src/audit/audit-log.ts
new file mode 100644
index 0000000..50630fa
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/audit-log.ts
@@ -0,0 +1,8 @@
+import { PaymentStatus } from '../types'
+
+export interface AuditLog {
+  paymentId: string
+  status: PaymentStatus
+  timestamp: number
+  payload?: any
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/payment-engine.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/payment-engine.ts
new file mode 100644
index 0000000..02461e8
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/payment-engine.ts
@@ -0,0 +1,37 @@
+import { PaymentStatus } from '../types'
+import { AuditLog } from '../audit/audit-log'
+import { EventBus } from './event-bus'
+
+export class PaymentEngine {
+  private status: PaymentStatus = 'CREATED'
+  private audit: AuditLog[] = []
+
+  constructor(
+    private events: EventBus,
+    private debug = false
+  ) {}
+
+  transition(status: PaymentStatus, payload?: any) {
+    this.status = status
+    this.audit.push({
+      paymentId: payload?.paymentId ?? 'unknown',
+      status,
+      timestamp: Date.now(),
+      payload
+    })
+
+    if (this.debug) {
+      console.log('[PiSDK][STATE]', status, payload)
+    }
+
+    this.events.emit(`payment:${status.toLowerCase()}`, payload)
+  }
+
+  getAuditTrail() {
+    return this.audit
+  }
+
+  getStatus() {
+    return this.status
+  }
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/plugin.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/plugin.ts
new file mode 100644
index 0000000..edc2d7b
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/plugin.ts
@@ -0,0 +1,7 @@
+import { PiSdk } from '../sdk'
+
+export interface PiSdkPlugin {
+  name: string
+  onInit?(sdk: PiSdk): void
+  onPaymentEvent?(event: string, payload: any): void
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/merchant.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/merchant.ts
new file mode 100644
index 0000000..adb1445
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/merchant.ts
@@ -0,0 +1,13 @@
+import { Merchant } from '../types'
+
+export class MerchantRegistry {
+  private merchants = new Map<string, Merchant>()
+
+  register(merchant: Merchant) {
+    this.merchants.set(merchant.merchantId, merchant)
+  }
+
+  get(id: string) {
+    return this.merchants.get(id)
+  }
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/connect.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/connect.ts
new file mode 100644
index 0000000..71e30ae
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/connect.ts
@@ -0,0 +1,24 @@
+import { PiUser } from '../types'
+
+declare global {
+  interface Window {
+    Pi: any
+  }
+}
+
+export async function connectPi(env: string): Promise<PiUser> {
+  if (env === 'mock') {
+    return { uid: 'mock', username: 'MockUser' }
+  }
+
+  if (!window.Pi) {
+    throw new Error('Pi SDK not loaded')
+  }
+
+  const auth = await window.Pi.authenticate(
+    ['payments', 'username'],
+    (err: any) => { if (err) throw err }
+  )
+
+  return auth.user
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/create-payment.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/create-payment.ts
new file mode 100644
index 0000000..7993a89
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/create-payment.ts
@@ -0,0 +1,36 @@
+import { MarketplacePayment } from '../types'
+import { PaymentEngine } from '../core/payment-engine'
+
+declare global {
+  interface Window {
+    Pi: any
+  }
+}
+
+export function createPayment(
+  data: MarketplacePayment,
+  engine: PaymentEngine
+) {
+  engine.transition('CREATED', data)
+
+  window.Pi.createPayment(
+    {
+      amount: data.amount,
+      memo: data.memo,
+      metadata: data.metadata
+    },
+    {
+      onReadyForServerApproval: (paymentId: string) =>
+        engine.transition('APPROVED', { paymentId }),
+
+      onReadyForServerCompletion: (paymentId: string) =>
+        engine.transition('SUBMITTED', { paymentId }),
+
+      onCancel: (paymentId: string) =>
+        engine.transition('CANCELLED', { paymentId }),
+
+      onError: (error: any, payment?: any) =>
+        engine.transition('FAILED', { error, payment })
+    }
+  )
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/sdk.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/sdk.ts
new file mode 100644
index 0000000..e2cfe38
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/sdk.ts
@@ -0,0 +1,50 @@
+import { PiSdkConfig, defaultConfig } from './core/config'
+import { EventBus } from './core/event-bus'
+import { PaymentEngine } from './core/payment-engine'
+import { MerchantRegistry } from './marketplace/merchant'
+import { PiSdkPlugin } from './plugins/plugin'
+import { MarketplacePayment, PiUser } from './types'
+import { connectPi } from './auth/connect'
+import { createPayment } from './payment/create-payment'
+
+export class PiSdk {
+  static user: PiUser | null = null
+
+  private events = new EventBus()
+  private engine: PaymentEngine
+  private merchants = new MerchantRegistry()
+  private plugins: PiSdkPlugin[] = []
+  private config: PiSdkConfig
+
+  constructor(config?: PiSdkConfig) {
+    this.config = { ...defaultConfig, ...config }
+    this.engine = new PaymentEngine(this.events, this.config.debug)
+  }
+
+  async connect() {
+    PiSdk.user = await connectPi(this.config.env!)
+    this.events.emit('user:connected', PiSdk.user)
+    return PiSdk.user
+  }
+
+  on(event: string, handler: any) {
+    this.events.on(event, handler)
+  }
+
+  use(plugin: PiSdkPlugin) {
+    plugin.onInit?.(this)
+    this.plugins.push(plugin)
+  }
+
+  registerMerchant(m: any) {
+    this.merchants.register(m)
+  }
+
+  pay(data: MarketplacePayment) {
+    createPayment(data, this.engine)
+  }
+
+  audit() {
+    return this.engine.getAuditTrail()
+  }
+}
diff --git a/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/src/index.ts b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/src/index.ts
new file mode 100644
index 0000000..e28e54c
--- /dev/null
+++ b/src/types/src/core/src/core/src/core/src/audit/src/core/src/plugins/src/marketplace/src/auth/src/payment/src/src/index.ts
@@ -0,0 +1,2 @@
+export * from './sdk'
+export * from './types'