Link Receipt or Invoice
Creates an attachment record linked to a transaction and returns a presigned S3 URL for direct file upload.
2-step flow:
- Call this endpoint with file metadata and the transaction ID — returns the attachment
idand theuploadUrl. - PUT the file binary to
uploadUrldirectly to S3 (not through the API).
The returned id can be used in Download attachment once the upload completes.
Idempotency: this endpoint does not support the Idempotency-Key header. Each call creates a new attachment record — a transaction can have multiple linked attachments.
curl -X POST "https://api-sandbox.contasimples.com/attachments/v1" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_TOKEN" \
-d '{
"transactionId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for the purchase"
}'
import requests
import json
url = "https://api-sandbox.contasimples.com/attachments/v1"
headers = {
"Content-Type": "application/json",
"Authorization": "Bearer YOUR_API_TOKEN"
}
data = {
"transactionId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for the purchase"
}
response = requests.post(url, headers=headers, json=data)
print(response.json())
const response = await fetch("https://api-sandbox.contasimples.com/attachments/v1", {
method: "POST",
headers: {
"Content-Type": "application/json",
"Authorization": "Bearer YOUR_API_TOKEN"
},
body: JSON.stringify({
"transactionId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for the purchase"
})
});
const data = await response.json();
console.log(data);
package main
import (
"fmt"
"net/http"
"bytes"
"encoding/json"
)
func main() {
data := []byte(`{
"transactionId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for the purchase"
}`)
req, err := http.NewRequest("POST", "https://api-sandbox.contasimples.com/attachments/v1", bytes.NewBuffer(data))
if err != nil {
panic(err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", "Bearer YOUR_API_TOKEN")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
fmt.Println("Response Status:", resp.Status)
}
require 'net/http'
require 'json'
uri = URI('https://api-sandbox.contasimples.com/attachments/v1')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['Authorization'] = 'Bearer YOUR_API_TOKEN'
request.body = '{
"transactionId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for the purchase"
}'
response = http.request(request)
puts response.body
{
"id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"status": "PROCESSING",
"referenceId": "111304",
"file": {
"name": "invoice.pdf",
"contentType": "PDF"
},
"description": "Invoice for purchase",
"createdAt": "2026-06-25T22:54:52.000Z",
"uploadUrl": "https://s3.amazonaws.com/bucket/key?X-Amz-Signature=..."
}
{
"error": "Bad Request",
"message": "One or more request parameters are invalid.",
"code": 400,
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"details": [
"The example field must have a value between 5 and 100.",
"Dates must be in YYYY-MM-DD format."
]
}
{
"error": "Unauthorized",
"message": "Invalid or expired access token.",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"code": 401
}
{
"error": "Internal Server Error",
"message": "An unexpected error occurred while processing the request.",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"code": 500
}
/attachments/v1
Target server for requests. Edit to use your own host.
Bearer token from OAuth 2.0 client credentials. Format: Bearer TOKEN
Bearer TOKENThe media type of the request body
ID of the transaction to link the document to. Corresponds to the id field returned by Banking statement (numeric — send its value as a string) or by Credit card statement (ULID).
Document description (optional).
Request Preview
Response
Response will appear here after sending the request
Authentication
Bearer token. Bearer token from OAuth 2.0 client credentials. Format: Bearer TOKEN
Body
ID of the transaction to link the document to. Corresponds to the id field returned by Banking statement (numeric — send its value as a string) or by Credit card statement (ULID).
111304