# OneLink Template Creation
## OneLink Template Creation
{% hint style="info" %}
### **Important**
Before creating a OneLink for your retargeting campaign, you must first **create a OneLink Template.**
Setting up a OneLink requires actions from **both MARKETER and DEVELOPER.**
{% endhint %}
**Marketer Actions**
1. Navigate the AppsFlyer UI: Engage > OneLink Management > New OneLink Template.
2. Name the template, choose the subdomain, and select the app.\
3. In the same OneLink Template, configure both iOS and AOS settings:
1. iOS Universal Links: Under "**When app is installed > Launch the app using iOS Universal Links**", fill out the [Team ID (App ID Prefix) and Bundle ID](https://dev.appsflyer.com/hc/docs/dl_ios_init_setup#getting-the-app-bundle-id-and-prefix-id:~:text=iOS%20Universal%20Links-,Getting%20the%20app%20bundle%20ID%20and%20prefix%20ID,-Log%20into%20your) (TeamID should be provided by your development team. You may share this guide with them for reference).\
\
2. Android App Links: Under **"When app is installed > Launch the app using Android App Links"**, fill out the [SHA256 fingerprint](https://dev.appsflyer.com/hc/docs/dl_android_init_setup#adding-app-link-intent-filter-to-main-activity:~:text=to%20the%20marketer.-,Generating%20a%20SHA256%20fingerprint%20while%20in%20production,-The%20SHA256%20fingerprint) (SHA256 should be provided by your development team. You may share this guide with them for reference). \
\
\
4. An auto-generated intent-filter code appears, provide the intent-filter code to the Android Developer.
5. Provide the subdomain created in Step 2 to both your iOS and Android Developers for the application setup.
6. Click Save OneLink template.
\
For iOS setting, please continue the instructions in [iOS Universal Link](#ios-universal-link)\
For AOS setting, please continue the instructions in [AOS App Link](#aos-app-link)
***
### iOS Universal Link
**Developer Action**
1. Enabling associated domains:\
[Configure app to register approved domains](https://dev.appsflyer.com/hc/docs/dl_ios_init_setup#enabling-associated-domains:~:text=your%20app.-,Configuring%20mobile%20apps%20to%20register%20approved%20domains,-Configuring%20mobile%20apps): add the subdomain (from Marketer) in Xcode.\
Example:\ 
2. Implement Deep linking code:\
**We highly recommend following this step-by-step tutorial to finish the setup and implement the code under "Deep linking" section**: \
\
\
You can also refer to this website for the details:\
→ **Once the OneLink Template is completed, AppsFlyer automatically generates the AASA file and hosts it for you. Note that it can take up to 1 hour for OneLink Template updates to take effect.**
***
### AOS App Link
**Developer Action**
1. Open the app's AndroidManifest.xml file, add the [intent-filter code](https://dev.appsflyer.com/hc/docs/dl_android_init_setup#:~:text=to%20the%20marketer.-,Adding%20App%20Link%20intent%2Dfilter%20to%20main%20activity,-Get%20the%20auto) to main activity.
2. Implement Deep linking code:\
**We highly recommend following this step-by-step tutorial to finish the setup and implement the code under "Deep linking" secion**: \
\
You can also refer to this website for the details:\
→ **Once the OneLink Template is completed, AppsFlyer automatically generates the Digital Asset Links JSON file and hosts it for you. Note that it can take up to 1 hour for OneLink Template updates to take effect.**
## Next Step
After finishing the OneLink Template Creation, please follow the [AppsFlyer - App Reengagement Campaign Settings](/app-campaign/appsflyer-integration/appsflyer-app-reengagement-campaign-settings.md) for the Integrated Partner setup.
{% hint style="info" %}
### Relevant Material
* [Appsflyer's Android deeplink setup guide](https://dev.appsflyer.com/hc/docs/dl_android_overview) **(For Developers)**
* [Appsflyer's iOS deeplink setup guide](https://dev.appsflyer.com/hc/docs/dl_ios_overview) **(For Developers)**
* [Appsflyer's create OneLinks template](https://support.appsflyer.com/hc/en-us/articles/207032246-Create-a-OneLink-template#add-redirection-logic-for-existing-app-users) **(For Marketers) \[Note: Step 5 is For Developers]**
{% endhint %}
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