Improve README usage documentation and examples

README.md

@@ -2,39 +2,45 @@
 
 [![CI](https://github.com/teesofttech/Termii.SDK/actions/workflows/ci.yml/badge.svg)](https://github.com/teesofttech/Termii.SDK/actions/workflows/ci.yml)
 
-A .NET SDK for the Termii messaging, token, and insights APIs.
+A .NET SDK for the Termii messaging, sender ID, Number API, Token API, and Insights APIs.
 
-> This SDK is in early development. The first milestones establish the client, tests, examples, API coverage matrix, and package structure before endpoint support is added feature by feature.
+## Installation
 
-## Current Status
-
-The initial repository setup includes:
-
-- A `Termii` SDK project targeting `netstandard2.0` and `net8.0`.
-- A lightweight unit test project.
-- An examples project for developer-facing usage.
-- An API coverage matrix in `docs/API_COVERAGE.md`.
-
-## Usage
-
-Install the package:
+Install from NuGet:
 
 ```bash
 dotnet add package Termii.SDK
 ```
 
+Then import the SDK namespace:
+
 ```csharp
 using Termii;
+```
 
+## Configuration
+
+Create a client manually:
+
+```csharp
 var client = new TermiiClient(new TermiiOptions
 {
     ApiKey = "your-termii-api-key"
 });
 ```
 
-The default base URL is `https://api.ng.termii.com`.
+The default base URL is `https://api.ng.termii.com`. Override it only when your Termii account or environment requires a different base URL:
+
+```csharp
+var client = new TermiiClient(new TermiiOptions
+{
+    ApiKey = "your-termii-api-key",
+    BaseUrl = new Uri("https://api.ng.termii.com"),
+    Timeout = TimeSpan.FromSeconds(30)
+});
+```
 
-For ASP.NET Core applications, register the SDK with dependency injection:
+For ASP.NET Core applications, register `TermiiClient` with dependency injection:
 
 ```csharp
 builder.Services.AddTermii(options =>
@@ -43,7 +49,35 @@ builder.Services.AddTermii(options =>
 });
 ```
 
-Send a message:
+Use it from a service or endpoint:
+
+```csharp
+public sealed class NotificationService
+{
+    private readonly TermiiClient _termii;
+
+    public NotificationService(TermiiClient termii)
+    {
+        _termii = termii;
+    }
+
+    public Task<TermiiMessageResponse> SendAsync(string phoneNumber, string message)
+    {
+        return _termii.Messaging.SendAsync(new SendMessageRequest
+        {
+            To = phoneNumber,
+            From = "Termii",
+            Sms = message,
+            Channel = TermiiMessageChannel.Generic,
+            Type = TermiiMessageType.Plain
+        });
+    }
+}
+```
+
+## Messaging
+
+Send a single SMS:
 
 ```csharp
 var response = await client.Messaging.SendAsync(new SendMessageRequest
@@ -56,22 +90,50 @@ var response = await client.Messaging.SendAsync(new SendMessageRequest
 });
 ```
 
-Fetch sender IDs:
+Send a bulk SMS:
 
 ```csharp
-var senderIds = await client.SenderIds.GetAsync();
+var response = await client.Messaging.SendBulkAsync(new SendBulkMessageRequest
+{
+    To = new[] { "2348012345678", "2348098765432" },
+    From = "Termii",
+    Sms = "Hello everyone",
+    Channel = TermiiMessageChannel.Generic,
+    Type = TermiiMessageType.Plain
+});
 ```
 
 Send through the Number API:
 
 ```csharp
-var numberMessage = await client.Numbers.SendAsync(new SendNumberMessageRequest
+var response = await client.Numbers.SendAsync(new SendNumberMessageRequest
 {
     To = "2348012345678",
     Sms = "Hello from a dedicated Termii number"
 });
 ```
 
+## Sender IDs
+
+Fetch sender IDs:
+
+```csharp
+var senderIds = await client.SenderIds.GetAsync();
+```
+
+Request a sender ID:
+
+```csharp
+var request = await client.SenderIds.RequestAsync(new RequestSenderIdRequest
+{
+    SenderId = "Termii",
+    UseCase = "Transactional alerts",
+    Company = "Example Ltd"
+});
+```
+
+## Tokens and OTP
+
 Send an OTP token:
 
 ```csharp
@@ -88,12 +150,115 @@ var token = await client.Tokens.SendAsync(new SendTokenRequest
 });
 ```
 
+Verify an OTP token:
+
+```csharp
+var verification = await client.Tokens.VerifyAsync(new VerifyTokenRequest
+{
+    PinId = token.PinId!,
+    Pin = "123456"
+});
+```
+
+Generate an in-app OTP:
+
+```csharp
+var generated = await client.Tokens.GenerateAsync(new GenerateTokenRequest
+{
+    PhoneNumber = "2348012345678",
+    PinType = TermiiTokenPinType.Numeric,
+    PinAttempts = 3,
+    PinTimeToLive = 10,
+    PinLength = 6
+});
+```
+
+The token client also supports voice OTP, voice call OTP, email OTP, and WhatsApp OTP through `SendVoiceAsync`, `CallAsync`, `SendEmailAsync`, and `SendWhatsAppAsync`.
+
+## Insights
+
 Check account balance:
 
 ```csharp
 var balance = await client.Insights.GetBalanceAsync();
 ```
 
+Check DND status:
+
+```csharp
+var dnd = await client.Insights.CheckDndAsync(new CheckDndRequest
+{
+    PhoneNumber = "2348012345678"
+});
+```
+
+Query number intelligence:
+
+```csharp
+var number = await client.Insights.QueryNumberAsync(new QueryNumberRequest
+{
+    PhoneNumber = "2348012345678",
+    CountryCode = "NG"
+});
+```
+
+Fetch message history:
+
+```csharp
+var history = await client.Insights.GetMessageHistoryAsync(new GetMessageHistoryRequest
+{
+    Page = 0,
+    Size = 15,
+    Sender = "Termii",
+    Receiver = "2348012345678"
+});
+```
+
+## Error Handling
+
+The SDK throws `TermiiApiException` for non-success HTTP responses from Termii:
+
+```csharp
+try
+{
+    await client.Messaging.SendAsync(new SendMessageRequest
+    {
+        To = "2348012345678",
+        From = "Termii",
+        Sms = "Hello from .NET",
+        Channel = TermiiMessageChannel.Generic
+    });
+}
+catch (TermiiApiException ex)
+{
+    Console.WriteLine($"HTTP status: {(int)ex.StatusCode}");
+    Console.WriteLine($"Termii code: {ex.TermiiCode}");
+    Console.WriteLine($"Termii message: {ex.TermiiMessage}");
+}
+```
+
+Request models also validate required fields before sending. Missing required values throw `ArgumentException`, and invalid numeric ranges throw `ArgumentOutOfRangeException`.
+
+## Supported APIs
+
+Implemented in the current SDK:
+
+- Messaging: send single, WhatsApp conversational, and bulk messages.
+- Sender IDs: list and request sender IDs.
+- Number API: send message through a dedicated Termii number.
+- Tokens: send, verify, generate, voice, email, and WhatsApp OTP flows.
+- Insights: balance, DND status, number intelligence, and message history.
+
+Deferred or not yet implemented:
+
+- WhatsApp template/device message APIs.
+- Campaign phonebook APIs.
+- Product notification email APIs.
+- Webhook event models.
+- `/api/sms/history/analytics`, pending additional verification.
+
+See [docs/API_COVERAGE.md](docs/API_COVERAGE.md) for the detailed coverage matrix.
+
 ## Examples
 
 Run the examples project after setting your Termii API key:
@@ -103,10 +268,17 @@ export TERMII_API_KEY="your-termii-api-key"
 dotnet run --project examples/Termii.Examples
 ```
 
-To send a live Number API example message, opt in explicitly:
+Run a live balance example:
 
 ```bash
-export TERMII_SEND_NUMBER_MESSAGE="true"
+export TERMII_EXAMPLE_ACTION="balance"
+dotnet run --project examples/Termii.Examples
+```
+
+Send a live Number API example message:
+
+```bash
+export TERMII_EXAMPLE_ACTION="number-message"
 export TERMII_EXAMPLE_PHONE_NUMBER="2348012345678"
 dotnet run --project examples/Termii.Examples
 ```
@@ -128,20 +300,15 @@ export TERMII_TEST_PHONE_NUMBER="2348012345678"
 dotnet test tests/Termii.IntegrationTests
 ```
 
-As endpoint support is added, integration tests should remain credential-gated so normal CI can run without network access or Termii credits.
-
-## Roadmap
+## Release
 
-Development is tracked through GitHub issues:
+Releases are published from version tags through GitHub Actions. See [docs/RELEASING.md](docs/RELEASING.md) for the checklist.
 
-- SDK foundation and HTTP pipeline.
-- Messaging APIs.
-- Sender ID and number APIs.
-- Token/OTP APIs.
-- Insights APIs.
-- CI, documentation, NuGet packaging, and GitHub Releases.
+## Links
 
-Official Termii documentation: https://developer.termii.com/
+- Termii developer docs: https://developer.termii.com/
+- NuGet package: https://www.nuget.org/packages/Termii.SDK
+- API coverage: [docs/API_COVERAGE.md](docs/API_COVERAGE.md)
 
 ## License
 

docs/API_COVERAGE.md

@@ -31,10 +31,10 @@ The Termii docs describe a REST/JSON API and state that each account has its own
 | API coverage matrix | Implemented | #14, PR #18 |
 | Error handling and request validation | Implemented | #6, PR #19 |
 | Reusable fake HTTP test helpers and opt-in live test conventions | Implemented | #10, PR #20 |
-| README endpoint examples | Planned | #12 |
+| README endpoint examples | In progress | #12 |
 | CI build/test/package validation | Implemented | #11, PR #22 |
 | NuGet package metadata and publishing workflow | Implemented | #8, PR #23 |
-| First GitHub Release and NuGet publish | Planned | #13 |
+| First GitHub Release and NuGet publish | Implemented | #13, PR #28, v0.2.0 |
 
 ## Endpoint Coverage
 
@@ -53,10 +53,10 @@ The Termii docs describe a REST/JSON API and state that each account has its own
 | Token | Send voice call token | POST | `/api/sms/otp/call` | JSON body | `TermiiClient.Tokens` | Implemented | #4, PR #26 | Unit tests added |
 | Token | Send email OTP token | POST | `/api/email/otp/send` | JSON body | `TermiiClient.Tokens` | Implemented | #4, PR #26 | Unit tests added |
 | Token | Send WhatsApp OTP token | POST | `/api/sms/send` | JSON body with `channel=whatsapp_otp` | `TermiiClient.Tokens` | Implemented | #4, PR #26 | Unit tests added |
-| Insights | Get balance | GET | `/api/get-balance` | Query | `TermiiClient.Insights` | In progress | #9 | Unit tests added |
-| Insights | Search DND/number status | GET | `/api/check/dnd` | Query | `TermiiClient.Insights` | In progress | #9 | Unit tests added |
-| Insights | Query number intelligence/status | GET | `/api/insight/number/query` | Query | `TermiiClient.Insights` | In progress | #9 | Unit tests added |
-| Insights | Fetch message inbox/history | GET | `/api/sms/inbox` | Query | `TermiiClient.Insights` | In progress | #9 | Unit tests added |
+| Insights | Get balance | GET | `/api/get-balance` | Query | `TermiiClient.Insights` | Implemented | #9, PR #27 | Unit tests added |
+| Insights | Search DND/number status | GET | `/api/check/dnd` | Query | `TermiiClient.Insights` | Implemented | #9, PR #27 | Unit tests added |
+| Insights | Query number intelligence/status | GET | `/api/insight/number/query` | Query | `TermiiClient.Insights` | Implemented | #9, PR #27 | Unit tests added |
+| Insights | Fetch message inbox/history | GET | `/api/sms/inbox` | Query | `TermiiClient.Insights` | Implemented | #9, PR #27 | Unit tests added |
 | Insights | Fetch message analytics/history | GET | `/api/sms/history/analytics` | Query | `TermiiClient.Insights` | Needs verification | #9 | Planned unit + optional integration |
 
 ## Deferred Coverage

examples/Termii.Examples/Program.cs

@@ -15,22 +15,33 @@
 
 Console.WriteLine($"Termii client configured for {client.Options.BaseUrl}.");
 
+var action = Environment.GetEnvironmentVariable("TERMII_EXAMPLE_ACTION");
 var phoneNumber = Environment.GetEnvironmentVariable("TERMII_EXAMPLE_PHONE_NUMBER");
-var sendNumberMessage = string.Equals(
-    Environment.GetEnvironmentVariable("TERMII_SEND_NUMBER_MESSAGE"),
-    "true",
-    StringComparison.OrdinalIgnoreCase);
 
-if (!sendNumberMessage || string.IsNullOrWhiteSpace(phoneNumber))
+if (string.Equals(action, "balance", StringComparison.OrdinalIgnoreCase))
 {
-    Console.WriteLine("Set TERMII_SEND_NUMBER_MESSAGE=true and TERMII_EXAMPLE_PHONE_NUMBER to send a Number API message.");
+    var balance = await client.Insights.GetBalanceAsync();
+
+    Console.WriteLine($"Balance: {balance.Balance} {balance.Currency}".Trim());
     return;
 }
 
-var response = await client.Numbers.SendAsync(new SendNumberMessageRequest
+if (string.Equals(action, "number-message", StringComparison.OrdinalIgnoreCase))
 {
-    To = phoneNumber,
-    Sms = "Hello from Termii.SDK",
-});
+    if (string.IsNullOrWhiteSpace(phoneNumber))
+    {
+        Console.WriteLine("Set TERMII_EXAMPLE_PHONE_NUMBER to send a Number API message.");
+        return;
+    }
+
+    var response = await client.Numbers.SendAsync(new SendNumberMessageRequest
+    {
+        To = phoneNumber,
+        Sms = "Hello from Termii.SDK",
+    });
+
+    Console.WriteLine($"Number API response: {response.Message ?? response.Code ?? "sent"}");
+    return;
+}
 
-Console.WriteLine($"Number API response: {response.Message ?? response.Code ?? "sent"}");
+Console.WriteLine("Set TERMII_EXAMPLE_ACTION=balance or TERMII_EXAMPLE_ACTION=number-message to run a live example.");