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KakaoTalk is a messaging app that is widely used in South Korea. When you have a business registered in South Korea, a business can register a KakaoTalk Business Channel which will allow the business to send both notification or advertisement messages to their customers on the KakaoTalk messaging app.    When a user has given the business their mobile number, it's possible to try and send a message to the user on KakaoTalk, for example, a welcome message. If the user is not registered on KakaoTalk, it can fallback to SMS so the business will reach them in any case.   The business can also receive a delivery receipt by subscribe the callback trigger - MESSAGE DELIVERY from the Conversation API and a reason will be sent if it failed to deliver: "reason": { "code": "BAD_REQUEST", "description": "The underlying channel reported: 3008: Phone number error", "sub_code": "UNSPECIFIED_SUB_CODE" },   If an advertisement message is sent and the user is not a "friend" to the KakaoTalk Business Channel then a reason will return as below: "reason": { "code": "CHANNEL_REJECT", "description": "The underlying channel reported: 3018: Unable to send messages (invalid or broken KakaoTalk user)", "sub_code": "UNSPECIFIED_SUB_CODE" },   Learn more Find out more about the Sinch KakaoTalk for Business channel. Sinch Developer Documentation site contains comprehensive documentation and tutorials, which show you how we support KakaoTalk using the Sinch Conversation API. ... View more

When a user sends a message or when the user adds your WeChat Official Account as "friends", an incoming message from WeChat will pass an unique contact identity for you to reply to. This unique contact identity is not their WeChat ID and it is not possible to request for any personal information such as WeChat ID or phone number of the user. For that reason, when you try to send a message to a WeChat user using their WeChat ID or phone number, the Conversation API will return error.   If you need to verify and merge the user with your CRM, then you can authenticate by asking them to scan a QR code that include their account information. After the authentication, you can update Conversation API via Contact Management API. The authentication is done solely on your system's backend and is not part of Conversation API.   The Sinch Developer Documentation site contains comprehensive documentation and tutorials, which show you how we support WeChat through the Sinch Conversation API. ... View more

It is not possible for business to send a message to a Telegram user using their Telegram ID or phone number.   When the user adds your Telegram Bot, an incoming message from Telegram will pass an unique contact identity for you to reply to. This unique contact identity is not their Telegram ID and it is not possible to request for any personal information such as Telegram ID or phone number of the user.   If you need to verify and merge the user with your CRM, then you can authenticate by asking them to scan a QR code that include their account information. After the authentication, you can update Conversation API via Contact Management API. The authentication is done solely on your system's backend and is not part of Conversation API.   The Sinch Developer Documentation site contains comprehensive documentation and tutorials, which show you how we support Telegram through the Sinch Conversation API. ... View more

When sending an AlimTalk message if your message delivery failed with an error code 3015,  check when the AlimTalk template you used was last used.   This error code can indicate that the AlimTalk template has became dormant. When a template has not been used more than one month, KakaoTalk will move the template into a dormant state. If you find that this template was last used more than a month ago, then you can contact Sinch customer support. Ask support to activate the template again by providing them with the template code, KakaoTalk Business Channel ID and your Sinch account details.   Alternatively, you can create a new AlimTalk template with a different template code. ... View more

Here is the list of couriers for which KakaoTalk supports the query of delivery.   List of Couriers Available to Query : KGB택배 우체국택배 로젠택배 일양로지스 GTX로지스 FedEx 한진택배 경동택배 합동택배 롯데택배 농협택배 호남택배 CU 편의점택배 CVSnet편의점택배 TNT Express USPS EMS 천일택배 DHL 대신택배 건영택배 한덱스. Note:  This list is subject to change and depends on the contracts between KakaoTalk and each courier.   Invoice number format:   우체국택배: 13 Numeric or 6 Numeric + 7 Numeric (Separator '-' or '_') example) 1234567890123, 123456-1234567, 123456_1234567 로젠택배: 11 Numeric or 3 Numeric + 4 Numeric + 4 Numeric (Separator '-' or '_')) example) 12345678901, 123-1234-1234, 123_1234_1234 일양로지스: 9~11 Numeric example) 123456789, 1234567890, 12345678901 FedEx: 12 Numeric example) 123456789012 한진택배: 10 Numeric or 12 Numeric example) 1234567890, 123456789012 경동택배: 9~16 Numeric or 4 Numeric + 3 Numeric + 6 Numeric (Separator '-') example) 123456789, 1234567890123456, 1234-123-123456 합동택배: 9~16 Numeric example) 123456789, 1234567890123456 롯데택배: 12 Numeric or 4 Numeric + 4 Numeric + 4 Numeric (Separator '-') example) 123456789012, 1234-1234-1234 농협택배: 12 Numeric example) 123456789012 호남택배: 10 Numeric example) 1234567890 천일택배: 11 Numeric example) 12345678901 대신택배: 13 Numeric example) 1234567890123 건영택배: 10 Numeric example) 1234567890 CU편의점택배: 10 Numeric or 12 Numeric or 4 Numeric + 4 Numeric + 4 Numeric (Separator '-' or '_') example) 1234567890, 123456789012, 1234-1234-1234, 1234_1234_1234 CVSnet편의점택배: 10 Numeric or 12 Numeric or 4 Numeric + 4 Numeric + 4 Numeric (Separator '-' or '_') example) 1234567890, 123456789012, 1234-1234-1234, 1234_1234_1234 한덱스: 10 Numeric or 14 Numeric example) 1234567890, 12345678901234 TNT Express: 8~9 Numeric example) 12345678, 123456789 USPS: 10 Numeric or 22 Numeric or 2 capital Alphabet + 9 Numeric + 2 capital Alphabet (No Separator) example) 1234567890, 1234567890123456789012, AB123456789AB EMS: 2 capital Alphabet + 9 Numeric + 2 capital Alphabet (No Separator) example) AB1234567890AB DHL: 10 Numeric example) 1234567890 굿투럭: 12 Numeric or 4 Numeric + 4 Numeric + 4 Numeric (Separator '-') 예시) 1234-1234-1234 ... View more