​
Inviting Users

The ContactsManager SDK provides a powerful invite system that enables controlled app growth, user acquisition tracking, and viral loop implementation. The invite service supports multiple distribution methods and provides detailed analytics for measuring growth effectiveness.

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Accessing the Invite Service

The invite service is accessed through the ContactsManager shared instance: 
import ContactsManager

let cm = ContactsService.shared
let inviteService = cm.invites

// Access invite properties and methods
let inviteCode = await inviteService.code
let inviteLink = await inviteService.link
let remainingInvites = await inviteService.remaining()

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Invite Code Management

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Getting Current Invite Code

Retrieve the user’s current invite code, or create one if none exists: 
let inviteCode = await cm.invites.code

if let code = inviteCode {
    print("Your invite code: \(code)")
    // Display code to user for sharing
} else {
    print("Unable to get invite code")
}
Retrieve the full invite URL for web-based sharing: 
let inviteLink = await cm.invites.link

if let link = inviteLink {
    print("Share this link: \(link)")
    // Use link for social sharing, email, etc.
} else {
    print("Unable to get invite link")
}

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Creating New Invites

Manually create a new invite (useful for generating fresh codes): 
let newInvite = await cm.invites.createInvite()

if let invite = newInvite {
    print("New invite code: \(invite.inviteCode)")
    print("New invite URL: \(invite.inviteUrl)")
    print("Expires at: \(invite.expiresAt)")
} else {
    print("Failed to create new invite")
}

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Invite Validation and Redemption

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Validating Invite Codes

Validate an invite code before allowing redemption: 
let validation = await cm.invites.validateCode(code: "ABC123")

if let result = validation {
    if result.valid {
        print("Valid invite from: \(result.inviter?.displayName ?? "Unknown")")
        print("Organization: \(result.organizationName ?? "N/A")")
        print("Remaining invites: \(result.remainingInvites ?? 0)")
    } else {
        print("Invalid invite: \(result.message)")
    }
} else {
    print("Unable to validate invite code")
}

​
Redeeming Invites

Redeem an invite code for a new user: 
let success = await cm.invites.redeemInvite(
    code: "ABC123", 
    for: "new_user_id_123"
)

if success {
    print("Invite redeemed successfully")
    // Proceed with user onboarding
} else {
    print("Failed to redeem invite")
}

​
Getting Invite Details (Public)

Get detailed invite information for landing pages (doesn’t require authentication): 
let details = await cm.invites.getInviteDetails(for: "ABC123")

if let inviteDetails = details {
    if inviteDetails.valid {
        print("Invited by: \(inviteDetails.inviter?.displayName ?? "Someone")")
        print("Join \(inviteDetails.organizationName ?? "this app")")
    } else {
        print("Invite expired or invalid")
    }
}

​
Invite Analytics and Tracking

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Checking Remaining Invites

Get the number of invites the current user has left: 
let remaining = await cm.invites.remaining()
print("You have \(remaining) invites remaining")

// Use this to show invite limits in UI
if remaining > 0 {
    // Show invite button
} else {
    // Show "no invites left" message
}

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Getting Invited Users

Retrieve the list of users invited by the current user: 
let invitedUsers = await cm.invites.invited()

print("You've invited \(invitedUsers.count) users:")
for user in invitedUsers {
    print("- \(user.displayName ?? "Unknown")")
}

// Use for showing invite success and building social proof

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Finding Who Invited You

Get information about who invited the current user: 
let inviter = await cm.invites.invitedBy()

if let whoInvitedMe = inviter {
    print("You were invited by: \(whoInvitedMe.displayName ?? "Unknown")")
    // Show connection to inviter in onboarding
    // Enable features that connect inviter and invitee
} else {
    print("You joined without an invite")
}

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Bulk Email Invitations

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Checking Email Invite Availability

Verify if bulk email invites are available for your organization: 
let emailAvailable = await cm.invites.isBulkInviteEmailAvailable()

if emailAvailable {
    // Show email invite options
    print("Email invites are available")
} else {
    // Show setup instructions or alternative invite methods
    print("Email invites require domain verification")
}

​
Sending Bulk Email Invites

Send invite emails to multiple contacts at once: 
// Get contacts to invite (from recommendations or user selection)
let contactsToInvite = await cm.people.fetch(
    matching: [.suggestedInvite], 
    limit: 10
)

let emailBody = """
Hi there!

I've been using this amazing app and thought you'd love it too. 
It's helped me stay organized and connect with friends.

Join me and let's explore it together!

Best,
[Your name]
"""

let result = await cm.invites.sendBulkInviteEmails(
    contacts: contactsToInvite,
    emailBody: emailBody
)

if let response = result {
    if response.success {
        print("Sent \(response.emailsSent) invites successfully")
        if !response.failedEmails.isEmpty {
            print("Failed to send to: \(response.failedEmails.joined(separator: ", "))")
        }
    } else {
        print("Email invite failed: \(response.message)")
    }
}

​
Building Invite Flows

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Basic Invite Sharing

Create a simple invite sharing interface: 
struct InviteView: View {
    @State private var inviteCode: String?
    @State private var inviteLink: String?
    @State private var remainingInvites: Int = 0
    @State private var isLoading = true
    
    var body: some View {
        VStack(spacing: 20) {
            if isLoading {
                ProgressView("Loading invite info...")
            } else {
                VStack(spacing: 16) {
                    Text("Invite Friends")
                        .font(.title2)
                        .fontWeight(.bold)
                    
                    Text("You have \(remainingInvites) invites remaining")
                        .foregroundColor(.secondary)
                    
                    if let code = inviteCode {
                        VStack {
                            Text("Your Invite Code")
                                .font(.headline)
                            Text(code)
                                .font(.title)
                                .fontWeight(.bold)
                                .padding()
                                .background(Color.gray.opacity(0.1))
                                .cornerRadius(8)
                        }
                    }
                    
                    if let link = inviteLink {
                        ShareLink(
                            item: URL(string: link)!,
                            message: Text("Join me on this amazing app!")
                        ) {
                            Label("Share Invite Link", systemImage: "square.and.arrow.up")
                                .frame(maxWidth: .infinity)
                                .padding()
                                .background(Color.blue)
                                .foregroundColor(.white)
                                .cornerRadius(8)
                        }
                    }
                }
            }
        }
        .padding()
        .onAppear {
            loadInviteInfo()
        }
    }
    
    private func loadInviteInfo() async {
        let cm = ContactsService.shared
        
        async let code = cm.invites.code
        async let link = cm.invites.link
        async let remaining = cm.invites.remaining()
        
        let (inviteCode, inviteLink, remainingCount) = await (code, link, remaining)
        
        DispatchQueue.main.async {
            self.inviteCode = inviteCode
            self.inviteLink = inviteLink
            self.remainingInvites = remainingCount
            self.isLoading = false
        }
    }
}

​
Invite Redemption Flow

Handle invite code redemption during onboarding: 
struct InviteRedemptionView: View {
    @State private var inviteCode = ""
    @State private var isValidating = false
    @State private var validationResult: ValidateInviteCodeResponse?
    @State private var showError = false
    
    var body: some View {
        VStack(spacing: 20) {
            Text("Enter Invite Code")
                .font(.title2)
                .fontWeight(.bold)
            
            TextField("Invite Code", text: $inviteCode)
                .textFieldStyle(RoundedBorderTextFieldStyle())
                .autocapitalization(.allCharacters)
                .onChange(of: inviteCode) { newValue in
                    if newValue.count == 6 {
                        validateInvite()
                    }
                }
            
            if isValidating {
                ProgressView("Validating...")
            }
            
            if let result = validationResult {
                if result.valid {
                    VStack {
                        Text("✅ Valid Invite")
                            .foregroundColor(.green)
                            .fontWeight(.bold)
                        
                        if let inviter = result.inviter {
                            Text("Invited by: \(inviter.displayName ?? "Unknown")")
                        }
                        
                        if let orgName = result.organizationName {
                            Text("Organization: \(orgName)")
                        }
                        
                        Button("Join App") {
                            redeemInvite()
                        }
                        .buttonStyle(.borderedProminent)
                    }
                } else {
                    Text("❌ \(result.message)")
                        .foregroundColor(.red)
                }
            }
        }
        .padding()
        .alert("Error", isPresented: $showError) {
            Button("OK") { }
        } message: {
            Text("Unable to validate invite code")
        }
    }
    
    private func validateInvite() {
        guard inviteCode.count == 6 else { return }
        
        isValidating = true
        
        Task {
            let result = await ContactsService.shared.invites.validateCode(code: inviteCode)
            
            DispatchQueue.main.async {
                self.isValidating = false
                self.validationResult = result
                if result == nil {
                    self.showError = true
                }
            }
        }
    }
    
    private func redeemInvite() {
        // Implement redemption logic with your user ID
        Task {
            let success = await ContactsService.shared.invites.redeemInvite(
                code: inviteCode,
                for: "current_user_id"
            )
            
            if success {
                // Navigate to main app
            } else {
                // Show error
            }
        }
    }
}

​
Invite Analytics Dashboard

Display invite performance and user relationships: 
struct InviteAnalyticsView: View {
    @State private var invitedUsers: [Contact] = []
    @State private var invitedBy: Contact?
    @State private var remainingInvites: Int = 0
    @State private var isLoading = true
    
    var body: some View {
        NavigationView {
            List {
                Section("Your Invite Status") {
                    HStack {
                        Text("Remaining Invites")
                        Spacer()
                        Text("\(remainingInvites)")
                            .fontWeight(.bold)
                    }
                    
                    if let inviter = invitedBy {
                        HStack {
                            Text("Invited by")
                            Spacer()
                            Text(inviter.displayName ?? "Unknown")
                        }
                    }
                }
                
                if !invitedUsers.isEmpty {
                    Section("People You've Invited (\(invitedUsers.count))") {
                        ForEach(invitedUsers, id: \.contactId) { user in
                            HStack {
                                VStack(alignment: .leading) {
                                    Text(user.displayName ?? "Unknown")
                                        .fontWeight(.medium)
                                    if let email = user.cmContact?.emailAddresses.first?.value {
                                        Text(email)
                                            .font(.caption)
                                            .foregroundColor(.secondary)
                                    }
                                }
                                Spacer()
                                Image(systemName: "checkmark.circle.fill")
                                    .foregroundColor(.green)
                            }
                        }
                    }
                }
            }
            .navigationTitle("Invite Analytics")
            .refreshable {
                await loadAnalytics()
            }
        }
        .onAppear {
            Task {
                await loadAnalytics()
            }
        }
    }
    
    private func loadAnalytics() async {
        let cm = ContactsService.shared
        
        async let invited = cm.invites.invited()
        async let inviter = cm.invites.invitedBy()
        async let remaining = cm.invites.remaining()
        
        let (invitedList, inviterContact, remainingCount) = await (invited, inviter, remaining)
        
        DispatchQueue.main.async {
            self.invitedUsers = invitedList
            self.invitedBy = inviterContact
            self.remainingInvites = remainingCount
            self.isLoading = false
        }
    }
}

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Best Practices

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Invite Limit Management

  • Start Conservative: Begin with 3-5 invites per user to create scarcity
  • Reward Quality: Give additional invites to users whose invitees become active
  • Monitor Growth: Adjust limits based on server capacity and user acquisition goals

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User Experience

  • Clear Value Proposition: Explain why users should invite friends
  • Social Proof: Show mutual connections and successful invitations
  • Immediate Connection: Help invited users connect with their inviter quickly

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Growth Optimization

  • Track Conversion: Monitor invite-to-signup and invite-to-active-user rates
  • A/B Test Messages: Experiment with different invite email templates
  • Analyze Networks: Identify users who bring high-quality new members

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Privacy Considerations

  • Minimal Exposure: Invite codes contain no personal information
  • User Control: Allow users to disable invite notifications
  • Data Retention: Implement policies for invite relationship data

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Error Handling

Common error scenarios and how to handle them: 
// Handle invite validation errors
let validation = await cm.invites.validateCode(code: userInput)

if let result = validation {
    if !result.valid {
        switch result.message {
        case "Invalid invite code format":
            // Show format help (6 characters, alphanumeric)
            break
        case "Invite code expired":
            // Suggest requesting new invite
            break
        case "Invite limit reached":
            // Explain invite limits
            break
        default:
            // Generic error message
            break
        }
    }
} else {
    // Network or service error
    // Show retry option
}

// Handle bulk email errors
let emailResult = await cm.invites.sendBulkInviteEmails(
    contacts: selectedContacts,
    emailBody: customMessage
)

if let result = emailResult {
    if !result.success {
        if result.message.contains("verified email sending domain") {
            // Guide user to domain verification
        } else if result.message.contains("Invalid request data") {
            // Check contact data quality
        }
    }
}
For more information about implementing invite features in your application, visit contactsmanager.io.