diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9421ab6..5987e73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,12 +7,12 @@ and this project uses [Calendar Versioning](https://calver.org/) (`YYYY.MINOR.MI
 
 ---
 
-## [2026.3.2] — 2026-05-29
+## [2026.3.2] — Unreleased
 
 ### Added
 
-- New payment methods for purchases and giveaways: `usdt_eth`, `usdt_pol`, `usdc_eth`, `usdc_base`, `usdc_pol`.
 - New `AlreadySubscribedError` exception for Premium purchase flows when Fragment returns: `This account is already subscribed to Telegram Premium.`
+- New `UserNotFoundError.NOT_A_USER` message for when Fragment returns: `Please enter a username assigned to a user.` (e.g. when the username belongs to a channel or bot).
 
 ### Changed
 
diff --git a/README.md b/README.md
index 95ee4b5..5d8fdb9 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ pip install git+https://github.com/bohd4nx/pyfragment.git@dev
 ```python
 import asyncio
 from pyfragment import FragmentClient
-
+from pyfragment.models.enums import PaymentMethod
 
 async def main() -> None:
     async with FragmentClient(
@@ -57,10 +57,17 @@ async def main() -> None:
 
         recipient = "https://t.me/username"  # also: @username, username
 
-        stars = await client.purchase_stars(recipient, amount=500, payment_method="usdt_ton")
-        print(f"Sent {stars.amount} Stars to {stars.username} | tx: {stars.transaction_id}")
+        stars = await client.purchase_stars(recipient, amount=500, payment_method=PaymentMethod.USDT_TON)
+        if stars.auto_paid:
+            print(f"Sent {stars.amount} Stars to {stars.username} | tx: {stars.transaction_id}")
+        else:
+            print(f"Manual payment required for {stars.username}")
+            print(f"Address:   {stars.payment_address}")
+            print(f"Amount:    {stars.payment_amount}")
+            print(f"Expires:   {stars.payment_expires_at}")
+            print(f"QR link:   {stars.payment_qr_link}")
 
-        premium = await client.purchase_premium(recipient, months=6, payment_method="ton")
+        premium = await client.purchase_premium(recipient, months=6, payment_method=PaymentMethod.TON)
         print(f"Sent Premium {premium.amount}m to {premium.username} | tx: {premium.transaction_id}")
 
 
diff --git a/pyfragment/domains/purchases/purchase.py b/pyfragment/domains/purchases/purchase.py
index 20a8b4d..8449dc6 100644
--- a/pyfragment/domains/purchases/purchase.py
+++ b/pyfragment/domains/purchases/purchase.py
@@ -59,6 +59,8 @@ async def purchase_stars(
 
     try:
         result = await client.call("searchStarsRecipient", {"query": username, "quantity": ""}, page_url=STARS_PAGE)
+        if "assigned to a user" in str(result.get("error", "")).lower():
+            raise UserNotFoundError(UserNotFoundError.NOT_A_USER.format(username=username))
         recipient = result.get("found", {}).get("recipient")
         if not recipient:
             raise UserNotFoundError(UserNotFoundError.NOT_FOUND.format(username=username))
@@ -140,6 +142,8 @@ async def purchase_premium(
 
     try:
         result = await client.call("searchPremiumGiftRecipient", {"query": username, "months": months}, page_url=PREMIUM_PAGE)
+        if "assigned to a user" in str(result.get("error", "")).lower():
+            raise UserNotFoundError(UserNotFoundError.NOT_A_USER.format(username=username))
         recipient = result.get("found", {}).get("recipient")
         if not recipient:
             raise UserNotFoundError(UserNotFoundError.NOT_FOUND.format(username=username))
diff --git a/pyfragment/exceptions.py b/pyfragment/exceptions.py
index 2b98d64..898396c 100644
--- a/pyfragment/exceptions.py
+++ b/pyfragment/exceptions.py
@@ -94,6 +94,7 @@ class UserNotFoundError(FragmentAPIError):
     NOT_FOUND = (
         "Telegram user '{username}' was not found on Fragment. Double-check the username and make sure the account exists."
     )
+    NOT_A_USER = "'{username}' does not belong to a user account. Make sure the username is assigned to a personal Telegram account, not a channel or bot."
 
 
 class AlreadySubscribedError(FragmentAPIError):
diff --git a/pyfragment/models/enums.py b/pyfragment/models/enums.py
index b9794b2..02b21ab 100644
--- a/pyfragment/models/enums.py
+++ b/pyfragment/models/enums.py
@@ -17,6 +17,8 @@ else:
 class PaymentMethod(StrEnum):
     TON = "ton"
     USDT_TON = "usdt_ton"
+
+    # Not supported yet
     USDT_ETH = "usdt_eth"
     USDT_POL = "usdt_pol"
     USDC_ETH = "usdc_eth"