Click this link and create a user - https://n8n.io/
Click “Add Workflow”.
Choose the module you will send data from (Webhook, Google sheet etc). We will use Webhook in this guide.
Change HTTP method to “Post”, and click “Listen For Test Event”.
Send a test payload to the “Test URL”. You will now see the structure of your payload body under “Output”.
Click on the “+” button on the top right corner. Choose “Helpers” ⇒ “HTTP Request”.
Under “HTTP Request” do the following:
Change “Method” to “Post”
Add your SEEN endpoint URL: https://next.seen.io/v1/projects/{Project_ID}/data
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You can find the endpoint in the Run tab of your project.
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Choose “Generic Credential Type” under “Authentication”, and “Header Auth” under “Generic Auth Type”
Create new credential: “Name” = “Authorization” & “Value” = “Bearer {Your API Token}”.
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You can create a token in the Run tab of your project.
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Toggle “Send Body” on and choose “JSON” as the “Body Content Type” as well as “Using JSON” as the “Specify Body”.
Use the following example structure using the “Input” ⇒ “Body” menu in the HTTP node to map your fields:

You can copy the above example here (make sure to change the content to match your project set-up):
{
"first_name":"{{ $json.body.first_name }}",
"id":"{{ $json.body.customer_id }}"
{
Replace and add relevant fields and corresponding placeholders for values based on the existing module you have connected