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Send the First SMS

POST Method

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SMS is a simple and cost-effective way to communicate with customers. This section details how to send your first outbound SMS using an API request.

Prerequisites

  • Before sending the SMS, you must configure the SMS channel in kaleyra.io.
  • After you sign up, your account will be on the trial version. You must complete the KYC to access all the features in kaleyra.io.
  • Before you get started, Create an API Key. To view the API Key and the SID, see View API Key and SID.
  • You must have an approved SenderID or a specific number to be used as SenderID.

Base URL

https://<api_domain>/v1/<SID>

API Domain and Value

api_domainValue
IN podapi.in.kaleyra.io
SG Podapi.ap.kaleyra.io
EU Podapi.eu.kaleyra.io

API request to send the first SMS

To send your first SMS use the <api_domain>/v1/<sid>/sms endpoint with the following request method:

Request Format

The following is the request format to send the first SMS:

curl -X POST "https://<api_domain>/v1/<sid>/sms" \
     -H "api-key:<api-key>" \
     -H "Content-Type:<content-type>" \
     -d "to=<to>" \
     -d "sender=<sender>" \
     -d "type=<type>" \
     -d "unicode=<unicode>"\
     -d "flash=<flash>"\
     -d "time=<time>"\
     -d "prefix=<prefix>"\
     -d "body=<body>" \
     -d "ref_custom=['<ref_custom>']"\
     -d "callback_profile_id=<callback_profile_id>" 

Sample Request Format

The following is the sample request format to send the first SMS:

curl -X POST "https://api.in.kaleyra.io/v1/HXAP16XXXXXX97IN/sms" \
     -H "api-key:Axxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3" \
     -H "Content-Type:application/json" \
     -d "to=+91XXXXXXXXXX" \
     -d "sender=KLRHXA" \
     -d "type=MKT" \
     -d "unicode=Auto"\
     -d "flash=1"\
     -d "time=2024-07-13T12:58:00+04:30"\
     -d "prefix=+91"\
     -d "body=Hello, this is your first SMS." \
     -d "ref_custom=['John','Doe']"\
     -d "callback_profile_id=IN_09b3dfa7-e05d-4d84-ab2d-6ed654272XXX" 

URL Parameters and Headers

Following is the list of parameters and headers to send the outgoing message request:

Parameter / HeadersData TypeDescriptionExampleMandatory?
sidStringAccount SID (Security Identifier).HXAP16XXXXXX97INYes
api-keyStringAPI key generated from kaleyra.io account.Axxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3Yes
content-typeStringIndicates the format of the content the API will be processing.The only allowed value is application/json.Yes
toStringPhone number of the end customer you want to send a message to.+91XXXXXXXXXXYes
(valid phone numbers only)
senderStringAlphanumeric Sender ID displayed on recipient devices.KLRHXAYes

Following is the list of attributes to be used in the payload to send the outgoing message:

ParameterData TypeDescriptionExampleMandatory?
typeStringRoute type.
Note: This is not a mandatory field. For customers in the Indian region, the available SMS Types are OTP, Transactional (TXN), Transactional DND (TXND), and Marketing (MKT). For Europe, America, and Singapore regions, only OTP and Default (to be used for Marketing and Transactional) route types are available.		MKTYes
unicodeStringDetermines message encoding. Acceptable values are "AUTO", "0", or "1". If you know it is a unicode message, then use 1. If you know it is not a unicode message, then use 0. If you are not sure about the unicode, then use Auto."Auto"No
flashStringDetermines if the message is a flash SMS. Acceptable values are "0" or "1".
Use 1, if you want to send the message as a flash message else use 0.		"0"No
timeISO DateThe time at which the message should be sent. Must be in ISO date format YYYY-MM-DDTHH:MM:SS+HH:MM."2024-07-13T12:58:00+04:30"No
prefixStringCountry code prefix. If the mobile number does not have a country code and you want to add it as a prefix you have the option to update it here."+91"No
bodyStringBody of the SMS. It is required irrespective of whether template_id is present or not."Hello, this is your first SMS."Yes
ref_customListIt contains an array of max 5 values that will be available in detailed reports and callback associated to the message. The values inside the array can have a maximum of 50 lengths in strings.["John","Doe"]No
callback_profile_idStringThe callback profile ID of the callback profile to be used to send webhook to your system about SMS status updates. For more information related to callback profiles, see callback profiles pageIN_09b3dfa7-e05d-4d84-ab2d-6ed654272XXXYes

Response Format

This section provides you the success and failure JSON response formats for different scenarios.

Success Response

The following success response is received when the JSON script has the correct syntax:

{
  "id": "ee8aXXXX-XXXX-XXXX-XXXX-9b717XXXX30d",
  "sender": "KLRHXA",
  "type": "DEFAULT",
  "body": "Hello, this is your first SMS.",
  "createdDateTime": "2024-07-13T12:58:00+04:30",
  "totalCount": 1,
  "data": [
    {
      "message_id": "ee8aXXXX-XXXX-XXXX-XXXX-9b717XXXX30d:1",
      "recipient": "+91XXXXXXXXXX"
    }
  ],
  "dlrurl": null,
  "error": {}
}

Failure Responses

The following failure responses are received when the JSON script has an incorrect syntax:

{
  "code": "E401",
  "message": "SMS length is exceeding 4000 characters.",
  "error": {
    "body": "SMS length is exceeding 4000 characters."
  }
}

Two-way SMS for Customer Engagement

Kaleyra's Two-Way SMS API offers an easy and efficient way to communicate with your customers. It allows you to instantly send and receive messages through your choice of long or short codes.

If you have purchased a two-way SMS number, you must pass the same number as a Sender ID in the above API call to initiate a two-way conversation with your customers.

📘

Note:

The two-way SMS for customer engagement feature is available based on region. For example, it is available for customers registered in the EU and the SG regions. This feature is not available for customers registered in the IN region.

Sample Request Format

curl --location --request POST "https://api.in.kaleyra.io/v1/HXAP16XXXXXX97IN/sms" \
--header "api-key: Axxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3" \
--header "Content-Type: application/json" \
--data-urlencode "to= +91XXXXXXXXXX" \
--data-urlencode 'body= Hello, this is your first SMS.' \
--data-urlencode 'sender= +917xxxxxx834' \
--data-urlencode 'type= MKT' \
--data-urlencode "ref_custom= ['John','Doe']"\
--data-urlencode "callback_profile_id= IN_09b3dfa7-e05d-4d84-ab2d-6ed654272XXX" 

📘

Note:

For Two-way SMS, the sender variable must be Numeric. For example, +917xxxxxx834.

SMS Error Codes, SMS Status and Status Trace Codes

Refer to the following links for Error Codes, Status and Status Trace Codes:

Updated 14 days ago