Integration
Connect Loop Returns to Lettr
When New Return Created fires in Loop Returns, your agent runs Add contact in Lettr. Describe the whole flow and it is built, tested on every scenario and kept running.
What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it.
Build solutions, not workarounds.
What do you want Loop Returns and Lettr to do together?
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Connect your AI client
Give your AI client this address.
https://mcp.apiant.aiOne connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser.
Set it up in your client
Claude Code
Run this in the directory you want to work in.
claude mcp add --transport http -s project apiant-ai https://mcp.apiant.aiStart Claude Code there, approve the server, and sign in in the browser page it opens.
Claude Code guide (opens in a new tab)Claude, web and desktop
Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first.
Setup guide (opens in a new tab)Cursor
Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser.
Setup guide (opens in a new tab)Zed
Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server.
Setup guide (opens in a new tab)Codex and the ChatGPT desktop app
Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in.
Setup guide (opens in a new tab)Any other MCP client
Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection.
Setup guide (opens in a new tab)Example flows
What Loop Returns can start in Lettr
When New Return Created in Loop Returns
then Add contact in Lettr
When Return Status Updated in Loop Returns
then Add contact to list in Lettr
Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships.
Everything your agent can do with Loop Returns and Lettr
Triggers and actions 2 triggers · 93 actions
Trigger
New Return CreatedTriggers when a new return is created in Loop.
Trigger
Return Status UpdatedTriggers when a Loop return changes state (for example open to closed or cancelled).
Action
Add Product to CollectionAttach a product to a collection.
Action
Add Product to Collection by External IDAttach a product to a collection by commerce `external_id`.
Action
Advanced Shipping NoticeThis endpoint will pull all packages by tracking statuses/timeframe. The ASN endpoint will return an array of
Action
Cancel Draft ReturnCancel a draft return.
Action
Cancel ReturnCancel a return in Loop. Canceling a return will allow a customer to make another return with the same
Action
Close ReturnClose a return. Closing a return will not fulfill any outcomes such as exchanges or gift cards, and the
Action
Create Allowlist ItemCreate an allowlist entry.
Action
Create Blocklist ItemCreate a blocklist entry.
Action
Create Bulk OperationUploads a JSONL file of order, product or other jobs and starts a Loop bulk operation that runs them.
Action
Create DestinationCreate a destination.
Action
Create Fraud ReportAttach a fraud report to a return.
Action
Create Return NotePost a new note to a return.
Action
Delete Allowlist ItemDelete an allowlist entry.
Action
Delete Blocklist ItemDelete a blocklist entry.
Action
Delete CollectionDelete a collection.
Action
Delete Collection by External IDDelete a collection by its commerce `external_id`.
Action
Delete CustomerDelete a customer.
Action
Delete Customer by External IDDelete a customer by its commerce `external_id`.
Action
Delete DestinationDelete a destination.
Action
Delete InventoryDelete an inventory.
Action
Delete Inventory by External IDsDelete an inventory record identified by the product variant's `external_id` and the location's `external_id`. If more than one product variant in the shop shares the same `external_id`, this request returns `409 Conflict`.
Action
Delete LocationDelete a location.
Action
Delete Location by External IDDelete a location by its commerce `external_id`.
Action
Delete OrderDelete a specific order.
Action
Delete Order by External IDDelete a specific order by its commerce `external_id`.
Action
Delete Product by External IDDelete a product by its commerce `external_id`.
Action
Delete Product from CollectionDelete a product from a collection.
Action
Delete Product from Collection by External IDDelete a product from a collection by commerce `external_id`.
Action
Delete Product VariantDelete a product variant.
Action
Delete Product Variant by External IDDelete a product variant by the parent product's commerce `external_id` and the variant's commerce `external_id`.
Action
Detailed Returns ListPull a detailed list of returns created within a given timeframe.
Action
Finalize ItemsFinalizes the returning items and cart items of the draft return.
Action
Flag ReturnFlag a return in Loop for review. This will prevent automated processing and will require a human to go
Action
Get All DestinationsRetrieve all destinations.
Action
Get Allowlist ItemRetrieve an allowlist entry.
Action
Get Blocklist ItemRetrieve a blocklist entry.
Action
Get Bulk OperationGet the details about a specific bulk operation.
Action
Get CollectionGet details about a single collection.
Action
Get Collection by External IDGet details about a single collection by its commerce `external_id`.
Action
Get CustomerGet details about a single customer.
Action
Get Customer by External IDGet details about a single customer by its commerce `external_id`.
Action
Get Destination DetailsGet details for a single destination.
Action
Get Draft ReturnRetrieves the details of a draft return, including its current state, returning items, cart items, and
Action
Get InventoryGet inventory details for a product variant by location.
Action
Get Inventory by External IDsGet inventory details for a product variant at a location, identified by the variant's `external_id` and the location's `external_id`. If more than one product variant in the shop shares the same `external_id`, this request returns `409 Conflict`.
Action
Get LocationGet the details about a single location.
Action
Get Location by External IDGet the details about a single location by its commerce `external_id`.
Action
Get OrderGet details about a specific order.
Action
Get Order by External IDGet details about a specific order by its commerce `external_id`.
Action
Get Product by External IDGet the details about a single product by its commerce `external_id`.
Action
Get Product VariantGet the details about a single product variant.
Action
Get Product Variant by External IDGet the details about a single product variant by the parent product's commerce `external_id` and the variant's commerce `external_id`.
Action
Get Return DetailsGet the details of a specific return based on a return's ID,
Action
Get Return NotesGet notes on a specific return using the return's ID.
Action
Get Shipment InformationGet high level information from a Happy Returns shipment.
Action
Get Shipment ItemsGet all items for a Happy Returns shipment.
Action
Get ShipmentsGet information about all Happy Returns shipments created within a given timeframe.
Action
List Allowlist ItemsRetrieve a list of paginated allowlist entries.
Action
List Blocklist ItemsRetrieve a list of paginated blocklist entries.
Action
List Bulk Operation JobsRetrieve a list of bulk operation jobs.
Action
List Bulk OperationsRetrieve a list of bulk operations. The list can be sorted and paginated using the parameters below.
Action
List CollectionsRetrieve a list of collections. The list can be filtered, sorted, and paginated using the parameters below.
Action
List CustomersRetrieve a list of customers. The list can be filtered, sorted, and paginated using the parameters below.
Action
List InventoriesRetrieve a list of inventories. The list can be filtered, sorted, and paginated using the parameters below.
Action
List LocationsRetrieve a list of locations. The list can be filtered, sorted, and paginated using the parameters below.
Action
List OrdersList all orders.
Action
List ProductsRetrieve a list of products. The list can be filtered, sorted, and paginated using the body parameters below.
Action
List Product VariantsRetrieve a list of product variants. The list can be filtered, sorted, and paginated using the body parameters below.
Action
Look Up Order Return Eligibility by Order NameReport per-line-item return eligibility for an order, by its order name, without starting a return.
Action
Process ReturnProcess a return in Loop based on the return ID. Processing a return will archive it in Loop and
Action
Remove Cart ItemRemoves a specific item from the draft return's cart.
Action
Remove Line ItemsRemove one or more line items from an open return.
Action
Remove Returning ItemRemoves a specific item from the draft return's ReturningItems.
Action
Set AddressSets the return shipping address for the draft return.
Action
Set Credit TypeSets the credit type for the draft return.
Action
Set CustomerSets the customer information for the draft return.
Action
Set Processing TypeSets the processing type (`regular` or `instant`) of the draft return.
Action
Set Returning Item Return TypeSets the return type for a specific returning item.
Action
Submit Draft ReturnSubmits the draft return.
Action
Unfinalize ItemsReopens the returning items and cart items of the draft return for modification.
Action
Update DestinationUpdate a destination.
Action
Upsert InventoryUpsert inventory details for a product variant by location. If the inventory exists, it will be updated; if it doesn't exist, it will be created.
Action
Add audience listCreates a new audience list in Lettr with the given name and returns the created list.
Action
Add contactAdds a new contact to your Lettr audience, optionally placing it on a list, setting custom properties, and sending a double opt-in confirmation email.
Action
Add contact to listAdds an existing contact to one of your audience lists. Succeeds whether the contact was newly added or was already on the list.
Action
Add templateCreates a new email template in Lettr from HTML or Topol editor JSON content, and publishes its first version with the merge tags found in the content.
Action
Delete contactPermanently deletes a contact from your Lettr audience.
Action
Get contactReturns a single audience contact, including its subscription status, custom properties, lists and topics.
Action
Get templateReturns a single email template by its slug, including its HTML, editor content, purpose, status and version details.
Action
List audience listsReturns all audience lists in your Lettr team, with each list's name and contact count.
Action
List contactsReturns the contacts in your Lettr audience, optionally narrowed by a search term, subscription status, list or segment.
Action
List templatesReturns the email templates in a Lettr project, optionally limited to one folder or to transactional or campaign templates.
Action
Update contactUpdates an existing contact in your Lettr audience, changing its email address, subscription status or custom properties. Fields left blank are not changed.
No trigger or action matches that. Ask your agent to add it: it reads the API documentation and builds what you describe.
Each app on its own
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Questions
Loop Returns and Lettr, answered
What can start an automation from Loop Returns?
Any of Loop Returns's 2 triggers in the catalog, including New Return Created and Return Status Updated. Describe the moment in plain language and your agent picks the right one.
What can your agent do in Lettr when something happens in Loop Returns?
Any of Lettr's 11 actions, including Update contact, Add audience list, Add contact and Add contact to list. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from Lettr to Loop Returns?
Lettr has no triggers in the catalog today, so automations start in Loop Returns. If you need the other direction, ask: your agent reads Lettr's API documentation and adds it.
Do I have to build a connector for Loop Returns or Lettr?
No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running.
Can my AI client use Loop Returns and Lettr without building an automation?
Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both.
What happens when something fails?
Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships.
Is there a free plan?
Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.