Click on the shortcut application on your iPhone

Click on "All shortcuts

Click + to create a new shortcut

Name your shortcut as you wish here "Business Card" then tick "In the share sheet" and "Display on the Apple Watch" then click OK to confirm.

Click on the + button to create the shortcut function

Select "Send a message

Personalise your message to be sent by sms including the link to your business card then click OK to confirm.

Once the shortcut has been created on your iPhone, go to your Apple Watch and click on the "Shortcut" button.

Select and click the shortcut for your digital business card

Click on "Add a contact

Choose how you want to enter your contact's number (by voice / from your phonebook / by manually entering the most frequently used number when you meet someone for the first time).

All you have to do is enter the number and click "Send" to send the text message to your correspondent

You now need to add the shortcut for your business card to the home screen of your Apple Watch so that you can launch it whenever you want by modifying one of the buttons on your Apple Watch and finding and integrating the shortcut for your card.