diff --git a/PadelClub/Views/Tournament/Screen/RegistrationSetupView.swift b/PadelClub/Views/Tournament/Screen/RegistrationSetupView.swift
index 16856e0..89f1ece 100644
--- a/PadelClub/Views/Tournament/Screen/RegistrationSetupView.swift
+++ b/PadelClub/Views/Tournament/Screen/RegistrationSetupView.swift
@@ -30,6 +30,7 @@ struct RegistrationSetupView: View {
     @State private var enableTimeToConfirm: Bool
     @State private var isTemplate: Bool
     @State private var isCorporateTournament: Bool
+    @State private var isValidating = false
 
     // Online Payment
     @State private var enableOnlinePayment: Bool
@@ -297,31 +298,21 @@ struct RegistrationSetupView: View {
                 }
             }
         })
-        .toolbar(content: {
-            if focusedField != nil {
-                ToolbarItem(placement: .topBarLeading) {
-                    Button("Annuler", role: .cancel) {
-                        focusedField = nil
-                    }
-                }
-            }
-        })
         .toolbar {
-            if focusedField != nil {
+            if focusedField == ._stripeAccountId, stripeAccountId.isEmpty == false {
                 ToolbarItem(placement: .keyboard) {
                     HStack {
-                        if focusedField == ._stripeAccountId, stripeAccountId.isEmpty == false {
-                            Button("Effacer") {
-                                stripeAccountId = ""
-                                tournament.stripeAccountId = nil
-                            }
-                            .buttonStyle(.borderless)
-                            Spacer()
-                            Button("Valider") {
-                                focusedField = nil
-                            }
-                            .buttonStyle(.bordered)
+                        Button("Effacer") {
+                            stripeAccountId = ""
+                            stripeAccountIdIsInvalid = false
+                            tournament.stripeAccountId = nil
+                        }
+                        .buttonStyle(.borderless)
+                        Spacer()
+                        Button("Valider") {
+                            focusedField = nil
                         }
+                        .buttonStyle(.bordered)
                     }
                 }
             }
@@ -418,12 +409,24 @@ struct RegistrationSetupView: View {
             
             if isCorporateTournament == false, dataStore.user.registrationPaymentMode.requiresStripe() {
                 VStack(alignment: .leading) {
-                    TextField("Identifiant du compte Stripe", text: $stripeAccountId)
-                        .frame(maxWidth: .infinity)
-                        .keyboardType(.default)
-                        .focused($focusedField, equals: ._stripeAccountId)
+                    LabeledContent {
+                        if isValidating {
+                            ProgressView()
+                        } else if focusedField == nil, stripeAccountIdIsInvalid == false, stripeAccountId.isEmpty == false, isValidating == false {
+                            Image(systemName: "checkmark.circle.fill").foregroundStyle(.green)
+                        }
+                    } label: {
+                        TextField("Identifiant du compte Stripe", text: $stripeAccountId)
+                            .frame(maxWidth: .infinity)
+                            .keyboardType(.default)
+                            .focused($focusedField, equals: ._stripeAccountId)
+                            .disabled(isValidating)
+                    }
                     if stripeAccountIdIsInvalid {
-                        Text("Format d'identifiant Stripe invalide.").foregroundStyle(.logoRed)
+                        Text("Identifiant Stripe invalide. Vous ne pouvez pas activer le paiement en ligne.").foregroundStyle(.logoRed)
+                        Button("Ré-essayer") {
+                            _confirmStripeAccountId()
+                        }
                     }
                 }
             }
@@ -450,7 +453,7 @@ struct RegistrationSetupView: View {
         }
         .onChange(of: focusedField) { old, new in
             if old == ._stripeAccountId {
-                _hasChanged()
+                _confirmStripeAccountId()
             }
         }
 
@@ -461,12 +464,86 @@ struct RegistrationSetupView: View {
         if stripeAccountId.isEmpty {
             tournament.stripeAccountId = nil
         } else if stripeAccountId.count >= 5, stripeAccountId.starts(with: "acct_") {
-            tournament.stripeAccountId = stripeAccountId.prefixMultilineTrimmed(255)
+            _checkStripeAccount(stripeAccountId.prefixMultilineTrimmed(255))
         } else {
             stripeAccountIdIsInvalid = true
         }
     }
     
+    private func _checkStripeAccount(_ accId: String) {
+        Task {
+            isValidating = true
+            do {
+                let response = try await _validateStripeAccountID(accId)
+                stripeAccountId = accId
+                stripeAccountIdIsInvalid = response.valid == false
+                enableOnlinePayment = response.valid
+            } catch {
+                stripeAccountIdIsInvalid = true
+                enableOnlinePayment = false
+            }
+            isValidating = false
+        }
+    }
+    
+    private func _validateStripeAccountID(_ accountID: String) async throws -> ValidationResponse {
+        let apiPath = "\(URLs.activationHost.rawValue)/utils/validate-stripe-account/"
+        let url = URL(string: apiPath)!
+        var request = URLRequest(url: url)
+        request.httpMethod = "POST"
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        
+        let body = ["account_id": accountID]
+        request.httpBody = try JSONEncoder().encode(body)
+        
+        do {
+            let (data, response) = try await URLSession.shared.data(for: request)
+            
+            guard let httpResponse = response as? HTTPURLResponse else {
+                throw ValidationError.invalidResponse
+            }
+            switch httpResponse.statusCode {
+            case 200...299:
+                let decodedResponse = try JSONDecoder().decode(ValidationResponse.self, from: data)
+                return decodedResponse
+            case 400:
+                // Handle bad request
+                let errorResponse = try JSONDecoder().decode(ValidationResponse.self, from: data)
+                return errorResponse
+            case 403:
+                // Handle permission error
+                let errorResponse = try JSONDecoder().decode(ValidationResponse.self, from: data)
+                return errorResponse
+            default:
+                throw ValidationError.invalidResponse
+            }
+        } catch let error as ValidationError {
+            throw error
+        } catch {
+            throw ValidationError.networkError(error)
+        }
+    }
+    
+    struct ValidationResponse: Codable {
+        let valid: Bool
+        let account: AccountDetails?
+        let error: String?
+    }
+
+    struct AccountDetails: Codable {
+        let id: String
+        
+        enum CodingKeys: String, CodingKey {
+            case id
+        }
+    }
+
+    enum ValidationError: Error {
+        case invalidResponse
+        case networkError(Error)
+        case invalidData
+    }
+    
     private func _hasChanged() {
         hasChanges = true
     }
@@ -496,7 +573,11 @@ struct RegistrationSetupView: View {
             }
             
             tournament.enableTimeToConfirm = enableTimeToConfirm
-            _confirmStripeAccountId()
+            if stripeAccountIdIsInvalid == false {
+                tournament.stripeAccountId = stripeAccountId
+            } else {
+                tournament.stripeAccountId = nil
+            }
         } else {
             tournament.accountIsRequired = true
             tournament.licenseIsRequired = true