Mail

Dashboard

Mail

Automatisch toegevoegd vanuit OpenAPI sync.

Verzonden e-mails ophalen

GET /v1/emails

invoices.read

App-wide email tracking. Scope invoices.read

Authorization: HTTP

type: http

scheme: bearer

Request body Geen

Geen

Response 2

data array Required

id string

subject string

status string

delivered_at string

opened_at string

clicked_at string

open_count integer

click_count integer

created_at string

meta object Required

{
    "data": [
        {
            "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
            "subject": "string",
            "status": "string",
            "delivered_at": "2026-07-01T12:00:00+00:00",
            "opened_at": "2026-07-01T12:00:00+00:00",
            "clicked_at": "2026-07-01T12:00:00+00:00",
            "open_count": 0,
            "click_count": 0,
            "created_at": "2026-07-01T12:00:00+00:00"
        }
    ],
    "meta": []
}

Examples

GET /v1/emails

curl -X GET "https://api.appficient.nl/v1/emails" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/emails'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/emails';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/emails';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/emails' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/emails");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/emails"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/emails", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/emails')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
    "data": [
        {
            "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
            "subject": "string",
            "status": "string",
            "delivered_at": "2026-07-01T12:00:00+00:00",
            "opened_at": "2026-07-01T12:00:00+00:00",
            "clicked_at": "2026-07-01T12:00:00+00:00",
            "open_count": 0,
            "click_count": 0,
            "created_at": "2026-07-01T12:00:00+00:00"
        }
    ],
    "meta": []
}

Curl, Node en response staan rechts naast dit endpoint.

Verzonden e-mail ophalen

GET /v1/emails/{id}

invoices.read

App-wide email tracking. Scope invoices.read

Authorization: HTTP

type: http

scheme: bearer

Path 1

Naam	Type	Beschrijving
`id` Required	string	Resource id (UUID, lowercase)

Request body Geen

Geen

Response 2

data object Required

id string

subject string

status string

delivered_at string

opened_at string

clicked_at string

open_count integer

click_count integer

created_at string

meta object Required

{
    "data": {
        "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "subject": "string",
        "status": "string",
        "delivered_at": "2026-07-01T12:00:00+00:00",
        "opened_at": "2026-07-01T12:00:00+00:00",
        "clicked_at": "2026-07-01T12:00:00+00:00",
        "open_count": 0,
        "click_count": 0,
        "created_at": "2026-07-01T12:00:00+00:00"
    },
    "meta": []
}

Examples

GET /v1/emails/{id}

curl -X GET "https://api.appficient.nl/v1/emails/{id}" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/emails/{id}'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/emails/{id}';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/emails/{id}';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/emails/{id}' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/emails/{id}");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/emails/{id}"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/emails/{id}", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/emails/{id}')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
    "data": {
        "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "subject": "string",
        "status": "string",
        "delivered_at": "2026-07-01T12:00:00+00:00",
        "opened_at": "2026-07-01T12:00:00+00:00",
        "clicked_at": "2026-07-01T12:00:00+00:00",
        "open_count": 0,
        "click_count": 0,
        "created_at": "2026-07-01T12:00:00+00:00"
    },
    "meta": []
}

Curl, Node en response staan rechts naast dit endpoint.

E-mailsjablonen ophalen

GET /v1/mail-templates

invoices.read

App-wide mail templates. Scope invoices.read

Authorization: HTTP

type: http

scheme: bearer

Request body Geen

Geen

Response 2

success boolean Required

true bij geslaagde call

Example: true

data object[]

type string

Example: invoice

title string

Example: Factuur

subject string

Example: Uw factuur

{
  "success": true,
  "data": [
    {
      "type": "invoice",
      "title": "Factuur",
      "subject": "Uw factuur"
    }
  ]
}

Examples

GET /v1/mail-templates

curl -X GET "https://api.appficient.nl/v1/mail-templates" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/mail-templates'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/mail-templates';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/mail-templates';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/mail-templates' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/mail-templates");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/mail-templates"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/mail-templates", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/mail-templates')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
  "success": true,
  "data": [
    {
      "type": "invoice",
      "title": "Factuur",
      "subject": "Uw factuur"
    }
  ]
}

Curl, Node en response staan rechts naast dit endpoint.

GET /v1/emails

curl -X GET "https://api.appficient.nl/v1/emails" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/emails'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/emails';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/emails';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/emails' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/emails");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/emails"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/emails", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/emails')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
    "data": [
        {
            "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
            "subject": "string",
            "status": "string",
            "delivered_at": "2026-07-01T12:00:00+00:00",
            "opened_at": "2026-07-01T12:00:00+00:00",
            "clicked_at": "2026-07-01T12:00:00+00:00",
            "open_count": 0,
            "click_count": 0,
            "created_at": "2026-07-01T12:00:00+00:00"
        }
    ],
    "meta": []
}

GET /v1/emails/{id}

curl -X GET "https://api.appficient.nl/v1/emails/{id}" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/emails/{id}'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/emails/{id}';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/emails/{id}';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/emails/{id}' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/emails/{id}");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/emails/{id}"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/emails/{id}", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/emails/{id}')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
    "data": {
        "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "subject": "string",
        "status": "string",
        "delivered_at": "2026-07-01T12:00:00+00:00",
        "opened_at": "2026-07-01T12:00:00+00:00",
        "clicked_at": "2026-07-01T12:00:00+00:00",
        "open_count": 0,
        "click_count": 0,
        "created_at": "2026-07-01T12:00:00+00:00"
    },
    "meta": []
}

GET /v1/mail-templates

curl -X GET "https://api.appficient.nl/v1/mail-templates" \
  -H "Authorization: Bearer apf_xxxxxxxx" \
  -H "Accept: application/json"

import requests

url = 'https://api.appficient.nl/v1/mail-templates'
headers = {
    'Authorization': 'Bearer apf_xxxxxxxx',
    'Accept': 'application/json',
}

response = requests.get(url, headers=headers)
data = response.json()

const url = 'https://api.appficient.nl/v1/mail-templates';
const options = {
  method: 'GET',
  headers: {
    Authorization: 'Bearer apf_xxxxxxxx',
    Accept: 'application/json',
  },
};

const res = await fetch(url, options);
const json = await res.json();

<?php
$url = 'https://api.appficient.nl/v1/mail-templates';
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer apf_xxxxxxxx',
        'Accept: application/json',
    ],
]);
$response = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
$json = json_decode($response, true);

postman request GET 'https://api.appficient.nl/v1/mail-templates' \
  --header 'Authorization: Bearer apf_xxxxxxxx' \
  --header 'Accept: application/json'

using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", "apf_xxxxxxxx");
client.DefaultRequestHeaders.Accept.Add(
    new MediaTypeWithQualityHeaderValue("application/json"));

using var request = new HttpRequestMessage(
    HttpMethod.Get,
    "https://api.appficient.nl/v1/mail-templates");

var response = await client.SendAsync(request);
var json = await response.Content.ReadAsStringAsync();

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();
HttpRequest.Builder builder = HttpRequest.newBuilder()
    .uri(URI.create("https://api.appficient.nl/v1/mail-templates"))
    .header("Accept", "application/json")
    .header("Authorization", "Bearer apf_xxxxxxxx");

HttpRequest request = builder.GET().build();

HttpResponse<String> response = client.send(
    request, HttpResponse.BodyHandlers.ofString());
String json = response.body();

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.appficient.nl/v1/mail-templates", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Authorization", "Bearer apf_xxxxxxxx")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.appficient.nl/v1/mail-templates')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

req = Net::HTTP::Get.new(uri)
req['Accept'] = 'application/json'
req['Authorization'] = 'Bearer apf_xxxxxxxx'

res = http.request(req)
data = JSON.parse(res.body)

{
  "success": true,
  "data": [
    {
      "type": "invoice",
      "title": "Factuur",
      "subject": "Uw factuur"
    }
  ]
}