Support for the standalone WhatsApp API will end on September 30, 2023. New customers must use, and existing customers must migrate to, the WhatsApp channel of the Conversation API. Any migration must be completed prior to September 30, 2023.


WhatsApp for Business messaging. The Sinch WhatsApp Business Messaging API provides a rich, enterprise grade messaging solution for clients who wish to communicate with their customers via WhatsApp.

The Sinch WhatsApp Business Messaging API provides a rich, enterprise grade messaging solution for clients who wish to communicate with their customers via WhatsApp.

With over 1.5 billion users globally using WhatsApp regularly to communicate with friends and family, it really does represent the digital extension of the users living room. It’s the inner circle of your customer’s communication so bringing your trusted brand communications to that inner circle has huge potential.

Integrating the Sinch WhatsApp Business Messaging API with your own backend systems enables Rich, High fidelity, contextual conversations to be established via the WhatsApp channel.


Try out the WhatsApp API live in our new tutorial here WhatsApp Tutorial.


The Sinch WhatsApp API securely authenticates via a bot identifier and bearer token pair. During the initial client on boarding process, these will be provided by your account manager.

To be able to authenticate the access token needs to be passed. For all WhatsApp end-points it's required to set the bearer token in the authorization HTTP header like: Authorization: Bearer AbCdEf123456. Where the string AbCdEf123456 is the bearer authorization token.

If no authentication header is present or if the bearer token is invalid, the API will respond with HTTP 401 Unauthorized.


Security scheme type HTTP
HTTP Authorization Scheme bearer

HTTP Errors

Responses with status 400 Bad Request, 401 Unauthorized, 403 Forbidden, and 500 Internal Server Error will present a JSON object in the body explaining the error. It has the following structure:

Name Description JSON Type
message A error message describing the general error. String
details Human readable description of the error. Can be used for debugging. String

Base URL

The following WhatsApp URLs can be used by the WhatsApp API. There are servers in the US and the EU. The link related to the region in which the Sender ID has been provisioned should be used. Note that these URLs can't be used interchangeably.

Server URL
US Production
EU Production


The following Swagger UI URLs can be used to test our API.

Server URL
US Production
EU Production


Header name Description Required
Authorization Bearer token described above Always
Content-Type Should be application/json when sending data through request body When body provided

Accepted media types

Any media file sent through the Sinch WhatsApp API will be processed before it's sent to the recipient. While the maximum file size for every uploaded media is 100 MB, be aware that the file also needs to meet the post-processing limits listed below. This means that a message with a file size that's larger than the post-processing limits is not guaranteed to be sent successfully. The result will depend on whether WhatsApp's post-processing of the media file can reduce the file size sufficiently or not.

Message type Supported content types Post-processing size limit
document Any content type listed for other message types,
text/plain, text/csv, application/pdf, application/msword, application/x-tar, application/rtf.0, application/,
100 MB
image image/jpeg, image/png 5 MB
audio audio/aac, audio/mp4, audio/amr, audio/mpeg, audio/ogg, audio/opus 16 MB
video video/mp4, video/3gpp 16 MB
sticker image/webp 100 KB

Video files must have H.264 video codec and AAC audio codec.


Media URLs in callbacks expire after seven days.

Formatting Text Messages

WhatsApp allows formatting your messages. Use these formatting symbols to format a message:

Symbol Formatting Example
Asterisk (*) Bold This is *nice*.
Underscore (_) Italics She said _yes_!
Tilde (~) Strikethrough What a ~rainy~ sunny day!
Three backticks (```) Code ```print 'Success';```

To use emojis in text, encode them with UTF-16 unicode.

Symbol Example
:grinning: Hi \ud83d\ude00
:white-check-mark: \u2705 repair the car
:musical-keyboard: I like \uD83C\uDFB9

Supported language codes

Following language codes are supported for template messages

Language Code
Afrikaans af
Albanian sq
Arabic ar
Azerbaijani az
Bengali bn
Bulgarian bg
Catalan ca
Chinese (CHN) zh_CN
Chinese (HKG) zh_HK
Chinese (TAI) zh_TW
Croatian hr
Czech cs
Danish da
Dutch nl
English en
English (UK) en_GB
English (US) en_US
Estonian et
Filipino fil
Finnish fi
French fr
German de
Greek el
Gujarati gu
Hausa ha
Hebrew he
Hindi hi
Hungarian hu
Indonesian id
Irish ga
Italian it
Japanese ja
Kannada kn
Kazakh kk
Korean ko
Lao lo
Latvian lv
Lithuanian lt
Macedonian mk
Malay ms
Malayalam ml
Marathi mr
Norwegian nb
Persian fa
Polish pl
Portuguese (BR) pt_BR
Portuguese (POR) pt_PT
Punjabi pa
Romanian ro
Russian ru
Serbian sr
Slovak sk
Slovenian sl
Spanish es
Spanish (ARG) es_AR
Spanish (SPA) es_ES
Spanish (MEX) es_MX
Swahili sw
Swedish sv
Tamil ta
Telugu te
Thai th
Turkish tr
Ukrainian uk
Urdu ur
Uzbek uz
Vietnamese vi
Zulu zu

Click to Chat

A business can provide a simple method via a Web Page, or embedded within a QR-Code to enable an end user to initiate a conversation through the WhatsApp Business API. While not a specific endpoint of the WhatsApp Business API, this method has been tested to work. From the businesses perspective, this avoids initial notification charges as the conversation is customer initiated. Furthermore, because the customer care session is immediately activated, an implicit 24 hour opt-in enables the business to reply during that time period.

The business would be advised to obtain an explicit, compliant opt-in during that initial customer care session to enable the business to initiate a future conversation using a notification (Template)

Conversation start URL:


With path variable parameters:

Name Description Constraints Required
phone Your WhatsApp Business Account phone number E.164 format without '+' sign. example 447537453580 Yes
text Message content to be sent to your account Any text No

Example to open conversation with +44 7537 453580:


Example to send message with content "Text message content" to +44 7537 453580:

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