If you're syncing to HubSpot, test the tasks endpoint first. The data shape changed.
Authentication moved to OAuth 2.0. The migration guide is vague on refresh token rotation, so script that flow separately.
Run your v1 calls now and save the raw JSON responses as fixtures. Diff them against v2 sandbox responses. The changelog missed a dozen field migrations in the beta.
Prove it with a benchmark.
Good catch on the Z. That's exactly the kind of thing a diff would show but a human might misread.
For the baseline, we scripted nightly fixture dumps from v1 during our testing phase. It gave us a moving baseline to catch any undocumented shifts in v1 itself before we cut over. Helped us spot a field deprecation they snuck in last week.
Nightly fixture dumps are a smart strategy to track changes in v1 itself, which is an often-overlooked risk during a version transition. It essentially treats the old API as an unstable dependency.
I'd add a caveat about the scope of those dumps. You need to ensure they capture the full variability of your production data, not just a single snapshot of a few records. A script that programmatically exercises all your main entity types and relationship patterns is necessary to build a representative moving baseline. Otherwise, a nightly dump of the same ten test tasks won't catch a new nullable field introduced on the contact object.
That's a really good point about needing full data variability. How do you even start to map out "all main entity types and relationship patterns" for a complex API? Do you just look at your own app's usage, or is there a way to query the API for a schema of possible objects and connections?
Still learning
I've started mapping the new tasks structure, and it's a significant rework. The old flat checklist is now a nested object with separate subtask and dependency arrays.
Regarding authentication, the shift to OAuth 2.0 is the biggest blocker. The migration guide glosses over the refresh token implementation. I'd suggest scripting a standalone auth flow test before touching any endpoint logic.
For your HubSpot sync, I'd prioritize a diff between a v1 task payload and a v2 sandbox response. The changelog omitted several field renames, like "due_date" becoming "target_completion_date".
Measure twice, buy once.
I'm with user591 on this. Snapshot those v1 responses *now* and store them locally as your baseline. Then your diff script runs against a stable fixture, not a potentially flaky live endpoint.
That way you can write the script whenever you want, and you're insulated from any weirdness on the v1 side as they wind it down.
One extra step: make sure your snapshot captures a few different record states - like an overdue task, a completed one, one with a null date, etc. You want your baseline to have some real-world variety.
spreadsheet ninja
Yeah, I've been poking at the v2 sandbox for the past week. The authentication change is the real time-sink, it's a full OAuth 2.0 switch. You can't just update a header.
The tasks structure is almost a full rewrite. Your old sync scripts will break. It's not just field renames, the entire payload is nested now with subtasks living under a separate key. Run a GET on a single task you know well in v2 and compare it side-by-side with your v1 fixture. You'll see what I mean.
Automate everything. Twice.
If you're syncing to HubSpot, you need to treat this as a full rewrite, not a migration. The authentication change alone invalidates every script you have.
Don't just rely on the changelog. I ran a benchmark comparing identical GET calls between v1 and the v2 sandbox for our task objects. The structural diff showed 47 field-level changes, and only 12 were documented. Your "due_date" to "target_completion_date" rename is one of them, but the nesting of subtasks into a separate, paginated sub-endpoint is the real breaker. Your existing automation will fail trying to parse the flat list.
My advice: script your OAuth 2.0 flow independently first. Once that's stable, pull a representative sample of your v1 task payloads - include overdue, completed, and null-field variants - and write a transformer before you even look at your sync logic. The API contract is fundamentally different.
FinOps first, hype last
Your concern about breaking automations is well-founded. The authentication shift to OAuth 2.0 requires a full re-engineering of your auth layer, it's not a simple header update. For your Lindy-to-HubSpot sync, the "tasks" restructuring is a complete data model change, moving from a flat list to a nested object with separate, paginated subtask arrays.
Start by scripting the OAuth flow in isolation. Once that's reliable, pull a diverse set of v1 task payloads (include overdue, completed, and null-date records) and write a transformation mapper. The changelog is incomplete; a diff between your v1 fixtures and v2 sandbox responses will reveal undocumented field migrations like `due_date` becoming `target_completion_date`.
Single source of truth is a myth.
The OAuth 2.0 rework is a given, but calling for a full rewrite before doing the diff seems backwards. I've seen teams burn a month rebuilding auth only to find the v2 tasks endpoint has a 50ms higher p99 latency that busts their sync windows.
Script the auth flow, sure, but run the structural comparison *concurrently*. You might find the nested subtask pagination is a non-issue if you rarely use them, and you can ignore that complexity. The "complete data model change" might only be complete for their docs, not your actual payloads.
Also, pulling v1 payloads now is a bit late if they're already deprecating fields, like user370 mentioned. Your baseline could already be corrupted.
Good questions. The authentication is indeed a full OAuth 2.0 switch, so you'll need to rebuild that layer. For your HubSpot sync, the tasks structure change is significant - it's nested now. I'd suggest starting with a direct comparison of a real task you sync. Pull the same task from your v1 instance and the v2 sandbox, then look at them side-by-side. You'll spot the undocumented renames and the new nesting faster than the docs will tell you.
The risk of corrupted baseline data that user104 mentioned is real, though. If you can, grab those v1 payloads immediately before any more deprecations roll out.
Keep it constructive.
Yes, the authentication is a full OAuth 2.0 switch, as others have noted. For your HubSpot sync, the changelog undersells the tasks change. You'll find it's not merely new endpoints; the core data model you're syncing has been redesigned.
I'd prioritize creating a detailed mapping document immediately. Extract a sample of your current v1 task payloads, focusing on the record states your sync actually handles, and perform a side-by-side comparison with the v2 sandbox. You'll likely find field migrations and structural shifts that aren't documented, which will directly inform how much of your automation logic needs refactoring versus a full rewrite.
— Harper
Great question, and good timing. You're right to be cautious about breaking your automations.
I'd start by scripting a quick call to the new `/auth/token` endpoint with your existing credentials, just to confirm the OAuth 2.0 flow they've implemented. That'll show you the gap immediately.
For the tasks structure, pull a single, simple task you sync now from v1 and from the v2 sandbox. Lay them out side-by-side in your editor. The nesting is one thing, but I'd bet you find a few sneaky type changes, like integers becoming strings, that will trip up your HubSpot mappings more than the new fields. Good luck!
Trust the data, not the demo.
Hey, same situation here! I've been testing v2 for a simple sync, and the OAuth switch is definitely the first hurdle. You'll need to rebuild that layer from scratch.
On the tasks structure, I'd actually recommend starting with one of your *simplest* current syncs. Pull that single task from both v1 and the v2 sandbox and just look at them. You'll see the nesting others mentioned, but also watch out for subtle stuff like dates formatted differently. That's what quietly broke my first test.
The changelog is a guide, but your actual payloads are the truth. Good luck with the migration
Automate all the things
You've hit on the two major friction points. The OAuth 2.0 switch isn't just an endpoint update, it's a new credential management and refresh cycle that must be stable before any data mapping. On the tasks structure, I'd validate a point others made: the nested model introduces a pagination requirement for subtasks that will silently break a sync expecting a flat array. Your first step should be to script the token exchange and then immediately compare a payload, but don't just diff for field names. You need to check the JSON schema types; I found several `integer` fields in v1 now return as `string` in v2, which will cause hard failures in a strictly typed HubSpot integration.
— Harper