curl --request PATCH \
  --url https://api.amplify.xyz/v1/esign_documents/{documentId}/theme \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "text": {
    "font": "Arial",
    "size": "18px",
    "style": [],
    "color": "#000000",
    "capitalization": "unset",
    "line_spacing": 2
  },
  "background": {
    "color": "#FFFFFF",
    "opacity": 100
  },
  "background_image": {
    "url": "",
    "size": "cover",
    "position": "left_top",
    "is_repeating": false,
    "opacity": 100
  },
  "applied_to_page": "all_pages"
}
'

import requests

url = "https://api.amplify.xyz/v1/esign_documents/{documentId}/theme"

payload = {
    "text": {
        "font": "Arial",
        "size": "18px",
        "style": [],
        "color": "#000000",
        "capitalization": "unset",
        "line_spacing": 2
    },
    "background": {
        "color": "#FFFFFF",
        "opacity": 100
    },
    "background_image": {
        "url": "",
        "size": "cover",
        "position": "left_top",
        "is_repeating": False,
        "opacity": 100
    },
    "applied_to_page": "all_pages"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    text: {
      font: 'Arial',
      size: '18px',
      style: [],
      color: '#000000',
      capitalization: 'unset',
      line_spacing: 2
    },
    background: {color: '#FFFFFF', opacity: 100},
    background_image: {
      url: '',
      size: 'cover',
      position: 'left_top',
      is_repeating: false,
      opacity: 100
    },
    applied_to_page: 'all_pages'
  })
};

fetch('https://api.amplify.xyz/v1/esign_documents/{documentId}/theme', 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.amplify.xyz/v1/esign_documents/{documentId}/theme",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'text' => [
        'font' => 'Arial',
        'size' => '18px',
        'style' => [
                
        ],
        'color' => '#000000',
        'capitalization' => 'unset',
        'line_spacing' => 2
    ],
    'background' => [
        'color' => '#FFFFFF',
        'opacity' => 100
    ],
    'background_image' => [
        'url' => '',
        'size' => 'cover',
        'position' => 'left_top',
        'is_repeating' => false,
        'opacity' => 100
    ],
    'applied_to_page' => 'all_pages'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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.amplify.xyz/v1/esign_documents/{documentId}/theme"

	payload := strings.NewReader("{\n  \"text\": {\n    \"font\": \"Arial\",\n    \"size\": \"18px\",\n    \"style\": [],\n    \"color\": \"#000000\",\n    \"capitalization\": \"unset\",\n    \"line_spacing\": 2\n  },\n  \"background\": {\n    \"color\": \"#FFFFFF\",\n    \"opacity\": 100\n  },\n  \"background_image\": {\n    \"url\": \"\",\n    \"size\": \"cover\",\n    \"position\": \"left_top\",\n    \"is_repeating\": false,\n    \"opacity\": 100\n  },\n  \"applied_to_page\": \"all_pages\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.patch("https://api.amplify.xyz/v1/esign_documents/{documentId}/theme")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"text\": {\n    \"font\": \"Arial\",\n    \"size\": \"18px\",\n    \"style\": [],\n    \"color\": \"#000000\",\n    \"capitalization\": \"unset\",\n    \"line_spacing\": 2\n  },\n  \"background\": {\n    \"color\": \"#FFFFFF\",\n    \"opacity\": 100\n  },\n  \"background_image\": {\n    \"url\": \"\",\n    \"size\": \"cover\",\n    \"position\": \"left_top\",\n    \"is_repeating\": false,\n    \"opacity\": 100\n  },\n  \"applied_to_page\": \"all_pages\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.amplify.xyz/v1/esign_documents/{documentId}/theme")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"text\": {\n    \"font\": \"Arial\",\n    \"size\": \"18px\",\n    \"style\": [],\n    \"color\": \"#000000\",\n    \"capitalization\": \"unset\",\n    \"line_spacing\": 2\n  },\n  \"background\": {\n    \"color\": \"#FFFFFF\",\n    \"opacity\": 100\n  },\n  \"background_image\": {\n    \"url\": \"\",\n    \"size\": \"cover\",\n    \"position\": \"left_top\",\n    \"is_repeating\": false,\n    \"opacity\": 100\n  },\n  \"applied_to_page\": \"all_pages\"\n}"

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