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Beginner20 minDeep links

Hand off to navigation with a resilient deep link

Encode a known place, protect campaign parameters, and provide browser and store fallbacks.

By the endA tested app-to-navigation hand-off across installed and uninstalled states.
Real-world scenario

Build against an explicit contract

A merchant app must hand a confirmed destination to navigation while surviving missing apps, unsupported modes, and rewritten links.

A Mappls developer projectA restricted Deep links applicationFixture data with no production credentialsA request, aggregate, or correlation ID strategy
Step 1

Define the user and system contract

A merchant app must hand a confirmed destination to navigation while surviving missing apps, unsupported modes, and rewritten links. Record the region, data freshness, latency budget, privacy purpose, credential owner, and fallback before choosing an SDK or endpoint.

Step 2

Freeze the destination

Create the link only from an accepted Mappls Pin or validated coordinates, choose the documented navigation intent, and encode labels separately from identity.

App Widgets & Deep Links · SDK or product slice
<a
  href="https://mappls.com/MMI000"
  target="_blank"
  rel="noopener noreferrer"
>
  Open this place in Mappls
</a>
Step 3

Own universal fallback

Route through an HTTPS page that can open the supported app link, show the destination, offer browser navigation, and link to the correct store without redirect loops.

Step 4

Test and observe state classes

Cover installed/uninstalled, Android/iOS/desktop, default-browser changes, offline state, and unsupported profiles; measure only the hand-off stage you can prove.

Step 5

Prove the production behavior

Automate the happy path and every named failure. The release is ready only when destination identity survives every fallback; a failed app open returns control to the user; no secret or private payload is encoded. Capture provider request identity without logging credentials or unnecessary precise location.

Recovery design

Failure modes you must exercise

app absent or association invalid

Fail fast with a typed, user-safe outcome and preserve the original request identity.

unsupported travel profile

Keep the last verified state, mark freshness honestly, and retry only within the documented idempotency boundary.

device is offline at hand-off

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

Never turn uncertainty into success

Timeout after a stateful command is an unknown outcome. Query by provider/idempotency identity or wait for authoritative events; do not blindly retry a new command.

Acceptance criteria

Definition of done

destination identity survives every fallbacka failed app open returns control to the userno secret or private payload is encoded

Deep links production checks

User or confidential data never appears in query parametersAll variable values are encoded and length-boundedApp and browser fallbacks reach the same intentRedirect and campaign domains are allow-listed and monitored
Grounded implementation

Continue from source, contracts, and a full app

These links resolve to repository-derived evidence; unsupported package names and endpoints are not filled in from guesswork.

Study the complete Coordinated incident response state machine
Tutorial complete

Run it, break it, then observe it

Start with fixture credentials, execute the failure plan, and use request logs, usage, webhook evidence, and operational metrics before promoting traffic.