change

src/routes/supplierRoute.js

@@ -651,9 +651,9 @@ module.exports = function (fastify, opts, next) {
         type: 'object',
         properties: {
           picture: {
-            type: 'object',
+            type: 'string',
             properties: {
-              data: { type: 'string' }, // Remove the "format" property
+              data: { type: 'string' }, 
               encoding: { type: 'string' },
               filename: { type: 'string' },
             },