debug: rename -d flag to -debug (#39)

* debug: rename -d flag to -debug

Fixes #38

* List 2 payments

CHANGELOG.md

@@ -1,4 +1,5 @@
 v 1.0.4
+  - debug: rename -d flag to -debug. #38
   - Remove hacks for pay_amount and payment_id with custom unmarshalling. #36
 
 v 1.0.3

README.md

@@ -36,6 +36,60 @@ Topic|Endpoint|Package.Method|Implemented
 $ go get github.com/matm/[email protected]
 ```
 
+## Usage
+
+Just load the config with all the credentials from a file or using a `Reader` then display the NOWPayments' API status and the last 2 payments
+made with:
+
+```go
+package main
+
+import (
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/matm/go-nowpayments/config"
+	"github.com/matm/go-nowpayments/core"
+	"github.com/matm/go-nowpayments/payments"
+)
+
+func main() {
+      // Load sandbox's credentials.
+	err := config.Load(strings.NewReader(`
+{
+      "server": "https://api-sandbox.nowpayments.io/v1",
+      "login": "[email protected]",
+      "password": "some_password",
+      "apiKey": "some_api_key"
+}
+`))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Use the server URL defined above.
+	core.UseBaseURL(core.BaseURL(config.Server()))
+	// Use default HTTP client.
+	core.UseClient(core.NewHTTPClient())
+
+	st, err := core.Status()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("API status:", st)
+
+	const limit = 2
+	ps, err := payments.List(&payments.ListOption{
+		Limit: limit,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Last %d payments: %v\n", limit, ps)
+}
+```
+
 ## CLI Tool
 
 A `np` tool is available to easily play with the payments API from the command line. Please make sure to target the sandbox API server in this case.
@@ -51,14 +105,19 @@ Usage of np:
   -a float
         pay amount for new payment/invoice (default 2)
   -c    show list of selected currencies
-  -d    turn debugging on
+  -case string
+        payment's case (sandbox only) (default "success")
+  -debug
+        turn debugging on
   -f string
         JSON config file to use
   -i    new invoice
   -l    list all payments
   -n    new payment
   -p string
         status of payment ID
+  -pc string
+        crypto currency to pay in (default "xmr")
   -pi string
         new payment from invoice ID
 ```

cmd/np/main.go

@@ -20,7 +20,7 @@ func main() {
 	payAmount := flag.Float64("a", 2.0, "pay amount for new payment/invoice")
 	payCurrency := flag.String("pc", "xmr", "crypto currency to pay in")
 	listPayments := flag.Bool("l", false, "list all payments")
-	debug := flag.Bool("d", false, "turn debugging on")
+	debug := flag.Bool("debug", false, "turn debugging on")
 	showCurrencies := flag.Bool("c", false, "show list of selected currencies")
 	newInvoice := flag.Bool("i", false, "new invoice")
 	newPaymentFromInvoice := flag.String("pi", "", "new payment from invoice ID")
@@ -45,6 +45,7 @@ func main() {
 
 	if *debug {
 		core.WithDebug(true)
+		fmt.Fprintln(os.Stderr, "Debug:", *debug)
 	}
 
 	if *paymentID != "" {