diff --git a/api/src/main/java/fr/gameovergne/api/service/prestashop/PrestashopClient.java b/api/src/main/java/fr/gameovergne/api/service/prestashop/PrestashopClient.java
index 2b01389..8f919c6 100644
--- a/api/src/main/java/fr/gameovergne/api/service/prestashop/PrestashopClient.java
+++ b/api/src/main/java/fr/gameovergne/api/service/prestashop/PrestashopClient.java
@@ -19,6 +19,9 @@ import java.util.Base64;
 @Slf4j
 public class PrestashopClient {
 
+    private static final MediaType APPLICATION_XML_UTF8 =
+            new MediaType("application", "xml", StandardCharsets.UTF_8);
+
     private final RestClient client;
     private final String baseUrl;
 
@@ -73,10 +76,11 @@ public class PrestashopClient {
     public String postXml(String path, MultiValueMap<String, String> params, String xmlBody) {
         String uri = buildUri(path, params);
         log.info("[PrestaShop] POST XML {}", uri);
+        byte[] bodyBytes = xmlBody.getBytes(StandardCharsets.UTF_8);
         return client.post()
                 .uri(uri)
-                .contentType(MediaType.APPLICATION_XML)
-                .body(xmlBody)
+                .contentType(APPLICATION_XML_UTF8)
+                .body(bodyBytes)
                 .retrieve()
                 .body(String.class);
     }
@@ -84,10 +88,11 @@ public class PrestashopClient {
     public String putXml(String path, MultiValueMap<String, String> params, String xmlBody) {
         String uri = buildUri(path, params);
         log.info("[PrestaShop] PUT XML {}", uri);
+        byte[] bodyBytes = xmlBody.getBytes(StandardCharsets.UTF_8);
         return client.put()
                 .uri(uri)
-                .contentType(MediaType.APPLICATION_XML)
-                .body(xmlBody)
+                .contentType(APPLICATION_XML_UTF8)
+                .body(bodyBytes)
                 .retrieve()
                 .body(String.class);
     }
@@ -125,12 +130,15 @@ public class PrestashopClient {
         }
 
         log.info("[PrestaShop] POST (proxy) {}", uri);
+        log.info("[PrestaShop] XML envoyé (proxy POST):\n{}", xmlBody);
+
+        byte[] bodyBytes = xmlBody.getBytes(StandardCharsets.UTF_8);
 
         try {
             return client.post()
                     .uri(uri)
-                    .contentType(MediaType.APPLICATION_XML)
-                    .body(xmlBody)
+                    .contentType(APPLICATION_XML_UTF8)
+                    .body(bodyBytes)
                     .retrieve()
                     .toEntity(String.class);
         } catch (RestClientResponseException ex) {
@@ -157,12 +165,15 @@ public class PrestashopClient {
         }
 
         log.info("[PrestaShop] PUT (proxy) {}", uri);
+        log.info("[PrestaShop] XML envoyé (proxy PUT):\n{}", xmlBody);
+
+        byte[] bodyBytes = xmlBody.getBytes(StandardCharsets.UTF_8);
 
         try {
             return client.put()
                     .uri(uri)
-                    .contentType(MediaType.APPLICATION_XML)
-                    .body(xmlBody)
+                    .contentType(APPLICATION_XML_UTF8)
+                    .body(bodyBytes)
                     .retrieve()
                     .toEntity(String.class);
         } catch (RestClientResponseException ex) {