There's no separate sandbox: a test lead goes into your real account, so it's easy to see exactly what a vendor's leads will look like. Here's how to keep tests tidy.
1. Use a key of its own
Make a posting key on a source called Test (Team, API keys, New posting key). Its leads are easy to find, and you can revoke the key when you're done.
2. Post a lead with made-up details
Use a phone number from 555-0100 to 555-0199 (numbers kept for films and tests, so nobody real gets a call) and an email at example.com (never emailed):
curl https://leadvault.com/api/v1/leads \
-H "Authorization: Bearer lv_post_..." \
-d type=mortgage -d first_name=Test -d last_name=Lead \
-d phone=3105550142 -d email=test@example.com -d state=CAThe answer has the new lead's id, and lists any names LeadVault didn't use under ignored, so you can spot a field with the wrong name.
3. Look at it
Open the lead in LeadVault: check the answers landed in the right questions, the source and who it went to.
Your distribution rules give the test lead to someone, and they get the new-lead alert. Tell them, or try it outside working hours.
4. Clean up
Delete the test lead (managers and admins: its page, A bad lead? Delete it.), and revoke the test key.
For the API's own mistakes, see API errors and how to fix them.
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