Go: Parse DLR from an Android SMS Gateway API

net/http, not a Go SDK product

Search intent for go android sms gateway api parse dlr is mapping a JSON status into your domain — not installing a vendor module. Service pricing is based on device count and total SMS sent through the gateway. Live contract: docs.sms-gateway.app. Go’s own HTTP client is enough (net/http).

If your mapper treats every 2xx GET as Delivered, you are parsing HTTP, not DLR.

curl -X GET "https://app.sms-gateway.app/api/v1/messages/41822" \
  -H "Authorization: Bearer $SMS_GATEWAY_API_KEY"

Same shape from Go:

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"time"
)

func main() {
	req, _ := http.NewRequest(http.MethodGet, os.Getenv("SMS_GATEWAY_DLR_URL"), nil)
	req.Header.Set("Authorization", "Bearer "+os.Getenv("SMS_GATEWAY_API_KEY"))
	client := &http.Client{Timeout: 15 * time.Second}
	res, err := client.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(body))
}

That is copyable REST. It is not “Download Go SDK.” Send sibling: C# send (same REST).

GET /messages/{id}

Persist the id from the send response. Example accepted body (nothing has left the device yet):

{
  "campaignId": 17,
  "accepted": 1,
  "scheduledAt": null,
  "messages": [
    {
      "id": 41822,
      "number": "+14155552671",
      "text": "Your verification code is 481920",
      "type": "sms",
      "status": "Pending",
      "campaignId": 17,
      "deviceId": 3
    }
  ]
}

Pending is not Delivered

Encode precedence in one function used by poll and webhook paths. Delivery reports.

Poll vs webhook reconciliation

Webhooks arrive at-least-once. Webhooks setup. Verify HMAC; dedupe on event id. Poll fills gaps — do not hammer GET.

Do not log the code

Log message id, masked MSISDN, status, latency. Strip Authorization. OTP verification. Priced by devices and SMS send volume. You use your own phone and operator SMS credit.

DLR mapper checklist

• net/http + env key; no fake SDK.
• Status enum from docs, not folklore.
• Delivered never regresses to Pending.
• Webhook + poll share one mapper.
• Staff canary before production OTP.

Next steps

Fetch one known id, map it, then subscribe. Pricing. Setup.