Add ad leads to Moosend mailing lists automatically with name, email, phone, and custom fields mapped -- so your automation workflows trigger instantly.
Connect Moosend with 4 lead sources
Moosend's API at api.moosend.com/v3/ uses your account API key as a query-string parameter (?apikey=...) rather than a header, and every endpoint returns its payload wrapped in a {Context: ...} envelope. LeadSync handles both quirks transparently -- you paste a single API key into the connection settings and the integration calls GET lists.json to enumerate every MailingList on your account so you can pick the destination for each lead source.
Each new Facebook, Google, LinkedIn, or TikTok lead is then a single POST to subscribers/{listId}/subscribe.json with the standard fields (Name, Email, Mobile) on the top-level payload and any custom fields appended to the CustomFields array as Name=Value strings -- the format Moosend's subscribe endpoint expects.
A subtle Moosend behaviour worth knowing: custom fields are defined per list rather than per account. So the field schema LeadSync's mapping screen shows you depends on which destination list you picked -- LeadSync calls lists/{listId}/details.json live, reads the CustomFieldsDefinition array, and surfaces every field defined on that specific list (with required fields flagged with an asterisk).
Switching the destination list mid-setup refreshes the field schema accordingly. The Email field is always required and uses an internal DEFAULT:Email identifier that LeadSync hoists onto the top-level Email key of the subscribe payload; DEFAULT:Name and DEFAULT:Mobile follow the same convention. You won't see the DEFAULT: prefix in the UI -- only inside Moosend API logs.
Moosend's automation workflows can use "member added to a list" as a trigger condition, which is the cleanest way to wire up paid-social welcome flows. Build a workflow in Moosend, point it at the list LeadSync writes to, and every new lead enters the workflow within seconds of submitting the ad form -- triggering welcome emails, drip sequences, conditional branching by custom field value, or behaviour-based segmentation.
For multi-source attribution, run one LeadSync connection per ad platform and point each one at a separate Moosend list. Facebook leads can drive a paid-social workflow in their own list while LinkedIn leads run a B2B nurture workflow elsewhere. Each list keeps its own custom-field schema, its own automation, and its own engagement reports -- which means clean attribution across the funnel without cross-channel contamination.
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