1. Enable Classic Customer Accounts
Single requires the use of classic customer accounts in your Shopify store for ticketed rentals. The default "new" customer accounts won't work for this purpose.
Steps
Log in to your Shopify admin
Go to Settings > Customer accounts
In the Accounts in online store and checkout section, click Edit
In the Login experience section, select Show login link in the header of online store and at checkout.
In the Choose which version of customer accounts to use section, select Classic customer accounts.
Click Save.
Note: For more on customer accounts, check out this Shopify article.
2. Disable Shopify ReCAPTCHA
To ensure a smooth sign-up and login experience for your viewers, it's necessary to deactivate reCAPTCHA at your Shopify store's checkout.
Steps
Log into your Shopify admin.
Go to Settings > Apps and sales channels.
From the Apps and sales channels page, click Online store.
Click Open sales channel.
Click Preferences.
In the Spam protection section, uncheck to deactivate Google reCAPTCHA
Save your settings.
Note: Refer to Shopify's checkout customization article for more information.
Once you've completed these prerequisites, you're all set to create your rentals in Single.