Eventually Ticketing
Troubleshooting

Reseller checkout fails with 'lastName must not be empty'

Reseller checkout for domains and site bundles can fail with the error Could not complete order: API error (400): lastName must not be empty when the signed-in user's Eventually profile has no last name. The app now uses the last name you enter in the Account step of checkout, and falls back to the registrant contact's last name only when checkout is submitted without one.

When this error appears

This error occurs during the reseller purchase flow for a domain or site-and-domain bundle, on the step before payment is processed. It happens when the signed-in user's Eventually profile has a blank last name, for example because the account was created with a single-word name.

Both purchase paths are affected because they share the same customer provisioning step:

  • Domain-only purchases from Settings → Domains & Sites → Buy a domain

  • Site-and-domain bundle purchases from Settings → Domains & Sites → Build a site

This failure occurs before any charge is captured, so there is no payment risk and no order is created.

Why the error happens

Reseller purchases create a Squarespace customer record using the signed-in user's Eventually profile name. Squarespace requires a non-empty last name for customer provisioning. If the user signed up with a single-word name (for example, only a first name), the profile last name is blank, and Squarespace rejects the request with a 400 error.

The checkout form itself requires a last name in the registrant contact section, but the provisioning step was using the profile name rather than the form value.

How the fix works

In the normal Account step, customer provisioning uses the last name you enter in the Account step. That field must be nonblank, and it takes precedence over the signed-in user's profile last name.

  • The registrant contact's last name from the checkout form is used only in the submit-time backstop, when checkout is submitted without an Account-step last name.

  • The registrant last name in the checkout form remains required.

What to do if you still see the error

If the error still appears after this fix:

  1. Confirm that the Last name field in the registrant contact form is filled in.

  2. Check that your Eventually profile has a last name saved. Go to Settings → User, edit Name, and select Save.

  3. Contact Eventually support with the exact error text and the page you were on (Domains or Sites).

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