diff --git a/htdocs/admin/multicurrency.php b/htdocs/admin/multicurrency.php
index 2b3263efbde..5afd1ce8c85 100644
--- a/htdocs/admin/multicurrency.php
+++ b/htdocs/admin/multicurrency.php
@@ -215,7 +215,7 @@ if ($conf->use_javascript_ajax) {
 print '</td></tr>';
 
 // Online payment with currency on document. This option should be on by default.
-if ($conf->global->MAIN_FEATURES_LEVEL >= 2) {
+if (getDolGlobalInt('MAIN_FEATURES_LEVEL') >= 2) {
 	print '<tr class="oddeven">';
 	print '<td>'.$langs->transnoentitiesnoconv("MULTICURRENCY_USE_CURRENCY_ON_DOCUMENT").'</td>';
 	print '<td class="center">';
@@ -260,51 +260,6 @@ print '</td></tr>';
 print '</table>';
 print '</div>';
 
-print '<br>';
-
-if (getDolGlobalString('MAIN_MULTICURRENCY_ALLOW_SYNCHRONIZATION')) {
-	print '<form method="POST" action="'.$_SERVER['PHP_SELF'].'" id="form_sync">';
-	print '<input type="hidden" name="token" value="'.newToken().'">';
-	print '<input type="hidden" name="action" value="setapilayer">';
-
-	print '<div class="div-table-responsive-no-min">';
-	print '<table class="noborder centpercent">';
-
-	$urlforapilayer = 'https://currencylayer.com'; //https://apilayer.net
-
-	print '<tr class="liste_titre">';
-	print '<td>'.$form->textwithpicto($langs->trans("CurrencyLayerAccount"), $langs->trans("CurrencyLayerAccount_help_to_synchronize", $urlforapilayer)).'</td>'."\n";
-	print '<td class="right">';
-	print '<textarea id="response" class="hideobject" name="response"></textarea>';
-	print '<input type="submit" name="modify_apilayer" class="button buttongen" value="'.$langs->trans("Modify").'">';
-	print '<input type="submit" id="bt_sync" name="bt_sync_apilayer" class="button buttongen" value="'.$langs->trans('Synchronize').'" />';
-	print '</td></tr>';
-
-	print '<tr class="oddeven">';
-	print '<td class="fieldrequired"><a target="_blank" rel="noopener noreferrer external" href="'.$urlforapilayer.'">'.$langs->transnoentitiesnoconv("multicurrency_appId").'</a></td>';
-	print '<td class="right">';
-	print '<input type="text" name="MULTICURRENCY_APP_ID" value="' . getDolGlobalString('MULTICURRENCY_APP_ID').'" size="28" />&nbsp;';
-	print '</td></tr>';
-
-	print '<tr class="oddeven">';
-	print '<td>'.$langs->transnoentitiesnoconv("multicurrency_appCurrencySource").'</td>';
-	print '<td class="right">';
-	print '<input type="text" name="MULTICURRENCY_APP_SOURCE" value="' . getDolGlobalString('MULTICURRENCY_APP_SOURCE').'" size="10" placeholder="USD" />&nbsp;'; // Default: USD
-	print '</form>';
-	print '</td></tr>';
-
-	/*print '<tr class="oddeven">';
-	print '<td>'.$langs->transnoentitiesnoconv("multicurrency_alternateCurrencySource").'</td>';
-	print '<td class="right">';
-	print '<input type="text" name="MULTICURRENCY_ALTERNATE_SOURCE" value="'.$conf->global->MULTICURRENCY_ALTERNATE_SOURCE.'" size="10" placeholder="EUR" />&nbsp;'; // Example: EUR
-	print '</td></tr>';*/
-
-	print '</table>';
-	print '</div>';
-	print '<br>';
-
-	print '</form>';
-}
 
 print '<div class="div-table-responsive-no-min">';
 print '<table class="noborder centpercent nomarginbottom">';
@@ -377,6 +332,53 @@ print '
 	</script>
 ';
 
+
+print '<br>';
+
+if (!getDolGlobalString('MULTICURRENCY_DISABLE_SYNC_CURRENCYLAYER')) {
+	print '<form method="POST" action="'.$_SERVER['PHP_SELF'].'" id="form_sync">';
+	print '<input type="hidden" name="token" value="'.newToken().'">';
+	print '<input type="hidden" name="action" value="setapilayer">';
+
+	print '<div class="div-table-responsive-no-min">';
+	print '<table class="noborder centpercent">';
+
+	$urlforapilayer = 'https://currencylayer.com'; //https://apilayer.net
+
+	print '<tr class="liste_titre">';
+	print '<td>'.$form->textwithpicto($langs->trans("CurrencyLayerAccount"), $langs->trans("CurrencyLayerAccount_help_to_synchronize", $urlforapilayer)).'</td>'."\n";
+	print '<td class="right">';
+	print '<textarea id="response" class="hideobject" name="response"></textarea>';
+	print '<input type="submit" name="modify_apilayer" class="button buttongen" value="'.$langs->trans("Modify").'">';
+	print '<input type="submit" id="bt_sync" name="bt_sync_apilayer" class="button buttongen" value="'.$langs->trans('Synchronize').'" />';
+	print '</td></tr>';
+
+	print '<tr class="oddeven">';
+	print '<td class="fieldrequired"><a target="_blank" rel="noopener noreferrer external" href="'.$urlforapilayer.'">'.$langs->transnoentitiesnoconv("multicurrency_appId").'</a></td>';
+	print '<td class="right">';
+	print '<input type="text" name="MULTICURRENCY_APP_ID" value="' . getDolGlobalString('MULTICURRENCY_APP_ID').'" size="28" />&nbsp;';
+	print '</td></tr>';
+
+	print '<tr class="oddeven">';
+	print '<td>'.$langs->transnoentitiesnoconv("multicurrency_appCurrencySource").'</td>';
+	print '<td class="right">';
+	print '<input type="text" name="MULTICURRENCY_APP_SOURCE" value="' . getDolGlobalString('MULTICURRENCY_APP_SOURCE').'" size="10" placeholder="USD" />&nbsp;'; // Default: USD
+	print '</td></tr>';
+
+	/*print '<tr class="oddeven">';
+	 print '<td>'.$langs->transnoentitiesnoconv("multicurrency_alternateCurrencySource").'</td>';
+	 print '<td class="right">';
+	 print '<input type="text" name="MULTICURRENCY_ALTERNATE_SOURCE" value="'.$conf->global->MULTICURRENCY_ALTERNATE_SOURCE.'" size="10" placeholder="EUR" />&nbsp;'; // Example: EUR
+	 print '</td></tr>';*/
+
+	print '</table>';
+	print '</div>';
+	print '<br>';
+
+	print '</form>';
+}
+
+
 // End of page
 llxFooter();
 $db->close();
diff --git a/htdocs/core/modules/modMultiCurrency.class.php b/htdocs/core/modules/modMultiCurrency.class.php
index c1e1a3a795a..2abcf240310 100644
--- a/htdocs/core/modules/modMultiCurrency.class.php
+++ b/htdocs/core/modules/modMultiCurrency.class.php
@@ -150,7 +150,7 @@ class modMultiCurrency extends DolibarrModules
 		$datestart=dol_mktime(21, 15, 0, $arraydate['mon'], $arraydate['mday'], $arraydate['year']);
 
 		$this->cronjobs = array(
-			0 =>array('priority'=>61, 'label'=>'MutltiCurrencyAutoUpdateCurrencies', 'jobtype'=>'method', 'class'=>'multicurrency/class/multicurrency.class.php', 'objectname'=>'MultiCurrency', 'method'=>'syncRates',             'parameters'=>'0,0,cron',      'comment'=>'Update all the currencies using the currencylayer API. An APi key needs to be given in the multi-currency module config on constant MULTICURRENCY_APP_ID', 'frequency'=>1, 'unitfrequency'=>2678400, 'status'=>$statusatinstall, 'test'=>'isModEnabled("cron")', 'datestart'=>$datestart),
+			0 =>array('priority'=>61, 'label'=>'MutltiCurrencyAutoUpdateCurrencies', 'jobtype'=>'method', 'class'=>'multicurrency/class/multicurrency.class.php', 'objectname'=>'MultiCurrency', 'method'=>'syncRates',             'parameters'=>'0,0,cron',      'comment'=>'Update all the currencies using the currencylayer API. An APi key needs to be given in the multi-currency module config page', 'frequency'=>1, 'unitfrequency'=>2678400, 'status'=>$statusatinstall, 'test'=>'isModEnabled("cron")', 'datestart'=>$datestart),
 		);
 
 		// Permissions
diff --git a/htdocs/multicurrency/class/multicurrency.class.php b/htdocs/multicurrency/class/multicurrency.class.php
index bee9aa4eced..a895c830d7e 100644
--- a/htdocs/multicurrency/class/multicurrency.class.php
+++ b/htdocs/multicurrency/class/multicurrency.class.php
@@ -638,15 +638,24 @@ class MultiCurrency extends CommonObject
 	/**
 	 * Sync rates from API
 	 *
-	 * @param 	string  $key                Key to use. Come from $conf->global->MULTICURRENCY_APP_ID.
+	 * @param 	string  $key                Key to use. Come from getDolGlobalString("MULTICURRENCY_APP_ID")
 	 * @param   int     $addifnotfound      Add if not found
 	 * @param   string  $mode				"" for standard use, "cron" to use it in a cronjob
-	 * @return  int							<0 if KO, >0 if OK, if mode = "cron" OK is
+	 * @return  int							<0 if KO, >0 if OK, if mode = "cron" OK is 0
 	 */
 	public function syncRates($key, $addifnotfound = 0, $mode = "")
 	{
 		global $conf, $db, $langs;
 
+		if (!getDolGlobalString('MULTICURRENCY_DISABLE_SYNC_CURRENCYLAYER')) {
+			if ($mode == "cron") {
+				$this->output = $langs->trans('Use of API for currency update is disabled by option MULTICURRENCY_DISABLE_SYNC_CURRENCYLAYER');
+			} else {
+				setEventMessages($langs->trans('Use of API for currency update is disabled by option MULTICURRENCY_DISABLE_SYNC_CURRENCYLAYER'), null, 'errors');
+			}
+			return -1;
+		}
+
 		if (empty($key)) {
 			$key = getDolGlobalString("MULTICURRENCY_APP_ID");
 		}
@@ -688,9 +697,9 @@ class MultiCurrency extends CommonObject
 				dol_syslog("Failed to call endpoint ".$response->error->info, LOG_WARNING);
 				if ($mode == "cron") {
 					$this->output = $langs->trans('multicurrency_syncronize_error', $response->error->info);
+				} else {
+					setEventMessages($langs->trans('multicurrency_syncronize_error', $response->error->info), null, 'errors');
 				}
-				setEventMessages($langs->trans('multicurrency_syncronize_error', $response->error->info), null, 'errors');
-
 				return -1;
 			}
 		} else {