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POST
/
api
/
v1
/
s3
/
presigned-upload-url
Generate a presigned URL for direct CSV upload
curl --request POST \
  --url https://app.asisso.com/api/v1/s3/presigned-upload-url \
  --header 'Content-Type: application/json' \
  --data '
{
  "file_name": "<string>",
  "file_size": 123,
  "content_type": "text/csv"
}
'
import requests

url = "https://app.asisso.com/api/v1/s3/presigned-upload-url"

payload = {
"file_name": "<string>",
"file_size": 123,
"content_type": "text/csv"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({file_name: '<string>', file_size: 123, content_type: 'text/csv'})
};

fetch('https://app.asisso.com/api/v1/s3/presigned-upload-url', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
CURLOPT_URL => "https://app.asisso.com/api/v1/s3/presigned-upload-url",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'file_name' => '<string>',
'file_size' => 123,
'content_type' => 'text/csv'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
package main

import (
"fmt"
"strings"
"net/http"
"io"
)

func main() {

url := "https://app.asisso.com/api/v1/s3/presigned-upload-url"

payload := strings.NewReader("{\n \"file_name\": \"<string>\",\n \"file_size\": 123,\n \"content_type\": \"text/csv\"\n}")

req, _ := http.NewRequest("POST", url, payload)

req.Header.Add("Content-Type", "application/json")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://app.asisso.com/api/v1/s3/presigned-upload-url")
.header("Content-Type", "application/json")
.body("{\n \"file_name\": \"<string>\",\n \"file_size\": 123,\n \"content_type\": \"text/csv\"\n}")
.asString();
require 'uri'
require 'net/http'

url = URI("https://app.asisso.com/api/v1/s3/presigned-upload-url")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"file_name\": \"<string>\",\n \"file_size\": 123,\n \"content_type\": \"text/csv\"\n}"

response = http.request(request)
puts response.read_body
{
  "upload_url": "<string>",
  "file_key": "<string>",
  "expires_in": 123
}
{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}
Uploading contacts is a two-step process. First call this endpoint to get a presigned upload URL, then PUT your CSV directly to that URL.
# Step 1: Get upload URL
curl -X POST https://your-asisso-instance/api/v1/s3/presigned-upload-url \
  -H "X-API-Key: dg_your_api_key"

# Response:
# { "upload_url": "https://...", "s3_key": "campaigns/..." }

# Step 2: Upload the CSV
curl -X PUT "https://presigned-url..." \
  -H "Content-Type: text/csv" \
  --data-binary @contacts.csv
Use the s3_key from the response as the source_url when creating a campaign.

CSV format

The CSV must include a phone_number column. Any additional columns are passed as initial_context to each call, making them available as template variables in the workflow.
phone_number,customer_name,plan
+14155550100,Jane Smith,premium
+14155550101,Bob Jones,basic

Headers

authorization
string | null
X-API-Key
string | null

Body

application/json
file_name
string
required

CSV filename

Pattern: .*\.csv$
file_size
integer
required

File size in bytes (max 10MB)

Required range: x <= 10485760
content_type
string
default:text/csv

File content type

Response

Successful Response

upload_url
string
required
file_key
string
required
expires_in
integer
required