curl "https://api.phrase.com/v2/projects/:project_id/translations" \
  -u USERNAME_OR_ACCESS_TOKEN \
  -X POST \
  -d '{"branch":"my-feature-branch","locale_id":"abcd1234cdef1234abcd1234cdef1234","key_id":"abcd1234cdef1234abcd1234cdef1234","content":"My translation"}' \
  -H 'Content-Type: application/json'

phrase translations create \
--project_id <project_id> \
--data '{"branch":"my-feature-branch", "locale_id":"abcd1234cdef1234abcd1234cdef1234", "key_id":"abcd1234cdef1234abcd1234cdef1234", "content": "My translation"}' \
--access_token <token>

import requests

url = "https://api.phrase.com/v2/projects/{project_id}/translations"

payload = {
    "branch": "my-feature-branch",
    "locale_id": "abcd1234cdef1234abcd1234cdef1234",
    "key_id": "abcd1234cdef1234abcd1234cdef1234",
    "content": "My translation",
    "plural_suffix": None,
    "unverified": None,
    "excluded": None,
    "autotranslate": None,
    "minor_change": False,
    "reviewed": False
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    branch: 'my-feature-branch',
    locale_id: 'abcd1234cdef1234abcd1234cdef1234',
    key_id: 'abcd1234cdef1234abcd1234cdef1234',
    content: 'My translation',
    plural_suffix: null,
    unverified: null,
    excluded: null,
    autotranslate: null,
    minor_change: false,
    reviewed: false
  })
};

fetch('https://api.phrase.com/v2/projects/{project_id}/translations', 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://api.phrase.com/v2/projects/{project_id}/translations",
  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([
    'branch' => 'my-feature-branch',
    'locale_id' => 'abcd1234cdef1234abcd1234cdef1234',
    'key_id' => 'abcd1234cdef1234abcd1234cdef1234',
    'content' => 'My translation',
    'plural_suffix' => null,
    'unverified' => null,
    'excluded' => null,
    'autotranslate' => null,
    'minor_change' => false,
    'reviewed' => false
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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://api.phrase.com/v2/projects/{project_id}/translations"

	payload := strings.NewReader("{\n  \"branch\": \"my-feature-branch\",\n  \"locale_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"key_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"content\": \"My translation\",\n  \"plural_suffix\": null,\n  \"unverified\": null,\n  \"excluded\": null,\n  \"autotranslate\": null,\n  \"minor_change\": false,\n  \"reviewed\": false\n}")

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

	req.Header.Add("Authorization", "<api-key>")
	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://api.phrase.com/v2/projects/{project_id}/translations")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"branch\": \"my-feature-branch\",\n  \"locale_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"key_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"content\": \"My translation\",\n  \"plural_suffix\": null,\n  \"unverified\": null,\n  \"excluded\": null,\n  \"autotranslate\": null,\n  \"minor_change\": false,\n  \"reviewed\": false\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.phrase.com/v2/projects/{project_id}/translations")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"branch\": \"my-feature-branch\",\n  \"locale_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"key_id\": \"abcd1234cdef1234abcd1234cdef1234\",\n  \"content\": \"My translation\",\n  \"plural_suffix\": null,\n  \"unverified\": null,\n  \"excluded\": null,\n  \"autotranslate\": null,\n  \"minor_change\": false,\n  \"reviewed\": false\n}"

response = http.request(request)
puts response.read_body

{
  "id": "abcd1234cdef1234abcd1234cdef1234",
  "content": "My translation",
  "unverified": false,
  "excluded": false,
  "plural_suffix": "",
  "key": {
    "id": "abcd1234cdef1234abcd1234cdef1234",
    "name": "home.index.headline",
    "plural": false,
    "use_ordinal_rules": false
  },
  "locale": {
    "id": "abcd1234cdef1234abcd1234cdef1234",
    "name": "de",
    "code": "de-DE"
  },
  "placeholders": [
    "%{count}"
  ],
  "state": "translated",
  "created_at": "2015-01-28T09:52:53Z",
  "updated_at": "2015-01-28T09:52:53Z",
  "user": {
    "id": "abcd1234cdef1234abcd1234cdef1234",
    "username": "joe.doe",
    "name": "Joe Doe"
  },
  "word_count": 2
}

{
  "message": "Validation Failed",
  "errors": [
    {
      "resource": "Resource",
      "field": "name",
      "message": "can't be blank"
    }
  ]
}