diff --git a/charts/cert-manager-webhook-gandi/gandiclient.go b/charts/cert-manager-webhook-gandi/gandiclient.go
new file mode 100644
index 0000000..0af0c65
--- /dev/null
+++ b/charts/cert-manager-webhook-gandi/gandiclient.go
@@ -0,0 +1,184 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httputil"
+	"time"
+)
+
+const (
+	GandiLiveDnsBaseUrl = "https://api.gandi.net/v5/livedns"
+)
+
+type GandiClient struct {
+	apiKey              string
+	dumpRequestResponse bool
+}
+
+type GandiRRSet struct {
+	Type   string   `json:"rrset_type"`
+	TTL    int      `json:"rrset_ttl"`
+	Name   string   `json:"rrset_name"`
+	Values []string `json:"rrset_values"`
+}
+
+type GandiRRSetValues struct {
+	TTL    int      `json:"rrset_ttl"`
+	Values []string `json:"rrset_values"`
+}
+
+func NewGandiClient(apiKey string) *GandiClient {
+	return &GandiClient{
+		apiKey:              apiKey,
+		dumpRequestResponse: false,
+	}
+}
+
+func (c *GandiClient) gandiRecordsUrl(domain string) string {
+	return fmt.Sprintf("%s/domains/%s/records", GandiLiveDnsBaseUrl, domain)
+}
+
+func (c *GandiClient) doRequest(req *http.Request, readResponseBody bool) (int, []byte, error) {
+	if c.dumpRequestResponse {
+		dump, _ := httputil.DumpRequest(req, true)
+		fmt.Printf("Request: %q\n", dump)
+	}
+
+	req.Header.Set("Authorization", fmt.Sprintf("Apikey %s", c.apiKey))
+	client := http.Client{
+		Timeout: 30 * time.Second,
+	}
+
+	res, err := client.Do(req)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	if c.dumpRequestResponse {
+		dump, _ := httputil.DumpResponse(res, true)
+		fmt.Printf("Response: %q\n", dump)
+	}
+
+	if res.StatusCode == http.StatusOK && readResponseBody {
+		data, err := ioutil.ReadAll(res.Body)
+		if err != nil {
+			return 0, nil, err
+		}
+		return res.StatusCode, data, nil
+	}
+
+	return res.StatusCode, nil, nil
+}
+
+func (c *GandiClient) HasTxtRecord(domain *string, name *string) (bool, error) {
+	// curl -X GET -H "Content-Type: application/json" \
+	//   -H "Authorization: Apikey $APIKEY" \
+	//   https://api.gandi.net/v5/livedns/domains/<DOMAIN>/records/<NAME>/<TYPE>
+	url := fmt.Sprintf("%s/%s/TXT", c.gandiRecordsUrl(*domain), *name)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return false, err
+	}
+
+	status, _, err := c.doRequest(req, false)
+	if err != nil {
+		return false, err
+	}
+
+	if status == http.StatusNotFound {
+		return false, nil
+	} else if status == http.StatusOK {
+		// Maybe parse response body here to really ensure that the record is present
+		return true, nil
+	} else {
+		return false, fmt.Errorf("unexpected HTTP status: %d", status)
+	}
+}
+
+func (c *GandiClient) CreateTxtRecord(domain *string, name *string, value *string, ttl int) error {
+	// curl -X POST -H "Content-Type: application/json" \
+	//   -H "Authorization: Apikey $APIKEY" \
+	//   -d '{"rrset_name": "<NAME>", "rrset_type": "<TYPE>", "rrset_ttl": 10800, "rrset_values": ["<VALUE>"]}' \
+	//   https://api.gandi.net/v5/livedns/domains/<DOMAIN>/records
+	rrs := GandiRRSet{Name: *name, Type: "TXT", TTL: ttl, Values: []string{*value}}
+	body, err := json.Marshal(rrs)
+	if err != nil {
+		return fmt.Errorf("cannot marshall to json: %v", err)
+	}
+
+	url := c.gandiRecordsUrl(*domain)
+	req, err := http.NewRequest("POST", url, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	status, _, err := c.doRequest(req, false)
+	if err != nil {
+		return err
+	}
+
+	if status != http.StatusCreated && status != http.StatusOK {
+		return fmt.Errorf("failed creating TXT record: %v", err)
+	}
+
+	return nil
+}
+
+func (c *GandiClient) UpdateTxtRecord(domain *string, name *string, value *string, ttl int) error {
+	// curl -X PUT -H "Content-Type: application/json" \
+	//   -H "Authorization: Apikey $APIKEY" \
+	//   -d '{"rrset_ttl": 10800, "rrset_values":["<VALUE>"]}' \
+	//   https://api.gandi.net/v5/livedns/domains/<DOMAIN>/records/<NAME>/<TYPE>
+	rrs := GandiRRSetValues{TTL: ttl, Values: []string{*value}}
+	body, err := json.Marshal(rrs)
+	if err != nil {
+		return fmt.Errorf("cannot marshall to json: %v", err)
+	}
+
+	url := fmt.Sprintf("%s/%s/TXT", c.gandiRecordsUrl(*domain), *name)
+	req, err := http.NewRequest("PUT", url, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	status, _, err := c.doRequest(req, false)
+	if err != nil {
+		return err
+	}
+
+	if status != http.StatusCreated && status != http.StatusOK {
+		return fmt.Errorf("failed updating TXT record: %v", err)
+	}
+
+	return nil
+}
+
+func (c *GandiClient) DeleteTxtRecord(domain *string, name *string) error {
+	// curl -X DELETE -H "Content-Type: application/json" \
+	//   -H "Authorization: Apikey $APIKEY" \
+	//   https://api.gandi.net/v5/livedns/domains/<DOMAIN>/records/<NAME>/<TYPE>
+	url := fmt.Sprintf("%s/%s/TXT", c.gandiRecordsUrl(*domain), *name)
+	req, err := http.NewRequest("DELETE", url, nil)
+	if err != nil {
+		return err
+	}
+
+	status, _, err := c.doRequest(req, false)
+	if err != nil {
+		return err
+	}
+
+	if status != http.StatusOK && status != http.StatusNoContent {
+		return fmt.Errorf("failed deleting TXT record: %v", err)
+	}
+
+	return nil
+}