diff --git a/extopy-commons/src/commonMain/kotlin/me/nathanfallet/extopy/models/auth/RegisterCodePayload.kt b/extopy-commons/src/commonMain/kotlin/me/nathanfallet/extopy/models/auth/RegisterCodePayload.kt
index 1aa7f7c..7630269 100644
--- a/extopy-commons/src/commonMain/kotlin/me/nathanfallet/extopy/models/auth/RegisterCodePayload.kt
+++ b/extopy-commons/src/commonMain/kotlin/me/nathanfallet/extopy/models/auth/RegisterCodePayload.kt
@@ -2,11 +2,15 @@ package me.nathanfallet.extopy.models.auth
 
 import kotlinx.datetime.LocalDate
 import kotlinx.serialization.Serializable
+import me.nathanfallet.extopy.models.users.User
+import me.nathanfallet.usecases.models.annotations.validators.StringPropertyValidator
 
 @Serializable
 data class RegisterCodePayload(
     val password: String,
+    @StringPropertyValidator(regex = User.USERNAME_REGEX, maxLength = 25)
     val username: String,
+    @StringPropertyValidator(maxLength = 40)
     val displayName: String,
     val birthdate: LocalDate,
 )