Integration
Connect Adyen to Lettr
When New payment authorisation fires in Adyen, 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 Adyen and Lettr to do together?
Ask the assistant
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 Adyen can start in Lettr
When New payment authorisation in Adyen
then Add contact in Lettr
When New refund in Adyen
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 Adyen and Lettr
Triggers and actions 2 triggers · 21 actions
Trigger
New payment authorisationWebhook AUTHORISATION: result of authorisation request.
Trigger
New refundWebhook REFUND: result of refund request.
Action
Add paymentStarts a payment (authorisation) in Adyen Checkout for the given amount, payment method and merchant account, and returns the payment's PSP reference and result code.
Action
Add payment linkCreates an Adyen Pay by Link payment link that a shopper can open to pay the given amount.
Action
Cancel paymentCancels an authorised payment that has not been captured yet, releasing the funds back to the shopper. The final outcome arrives later in Adyen's CANCELLATION webhook.
Action
Capture paymentCaptures an authorised payment (full or partial amount). Adyen processes the capture asynchronously: the response always has status "received" and the final outcome arrives later in a CAPTURE webhook.
Action
Delete stored payment methodDeletes (disables) a shopper's stored payment details token in Adyen.
Action
Get payment linkRetrieves the details of a payment link, including its amount, status (active, completed, expired or paymentPending), url and expiry.
Action
List payment methodsRetrieves the payment methods available for a transaction, based on details such as amount, country and currency, plus the shopper's stored payment methods when a shopper reference is given.
Action
List stored payment methodsLists the tokens for payment details stored for a shopper, with a summary of each stored card or account.
Action
Refund paymentRefunds a captured Adyen payment, fully or partially. Adyen acknowledges the request immediately; the final outcome arrives later in a REFUND notification.
Action
Update payment linkUpdates the status of an Adyen payment link. Adyen only allows setting the status to expired, which forces the link to expire so shoppers can no longer pay with it.
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
Reviews
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Questions
Adyen and Lettr, answered
What can start an automation from Adyen?
Any of Adyen's 2 triggers in the catalog, including New payment authorisation and New refund. Describe the moment in plain language and your agent picks the right one.
What can your agent do in Lettr when something happens in Adyen?
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 Adyen?
Lettr has no triggers in the catalog today, so automations start in Adyen. 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 Adyen 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 Adyen 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.