Connecting Omnisend to an OptiMonk campaign means everyone who fills out your popup form is added to the Omnisend list you picked — no exports, no copy-paste.
Look for "Soundest" in the provider list. Omnisend used to be called Soundest, and that is still the name of the integration type in OptiMonk. Searching for Omnisend in the provider picker returns nothing; search for Soundest instead. Everything behind it is Omnisend.
Before you start: you need a campaign in OptiMonk (the popup has to be built, because the field mapping is read from the input fields of your popup) and an Omnisend account.
Step 1 — Create an API key in Omnisend
Log in to your Omnisend account. Click your icon in the top right corner and select Store settings.
Select API keys under Integrations & API.
If you do not have any API keys yet, click Create API Key.
Choose the This API key will only allow to add the new subscribers option, give the key a name, and click Save.
Click the copy icon next to your API key.
OptiMonk's own hint says the same: To retrieve your API key, log in to your Omnisend account. Click on 'Store settings' -> 'Integrations & API' tab. Create a new API key, then copy and paste it here.
Step 2 — Connect it to your campaign in OptiMonk
Open Campaigns in the left menu and click the campaign you want to connect.
Open the Integrations tab of the campaign.
Click Add integration. If this is your first one, the same step is offered as Connect your email or SMS tool.
Provider step: type Soundest into Search providers… and select it. Accounts you have already connected are listed at the top, under Your connected accounts.
Account step: choose a connected account, or add a new one. Paste the API key you copied from Omnisend into the credential field.
Use Name (optional) to call the connection Omnisend — that is the name you will see in your list of connected accounts from then on, and it saves you from hunting for "Soundest" later.
Click Connect. If the key is wrong you get Connection failed — check the credentials.
List step: pick the list new signups should join, then click Continue. Use Search lists… if the list is long.
Field mapping step: Choose where each popup field goes in Soundest. The left column is Popup field (every input your popup collects), the right one is the Omnisend field.
Pick Don't sync for any popup field you don't want to send.
Under Static fields you can send a fixed value with every submission — click Add static field, type the value on the left and choose the target field on the right. This is a good place to tag where the subscriber came from.
Click Save integration.
That's it! From now on, whenever a visitor signs up through this campaign, they are added to your Omnisend list.
Draft vs. live: if the campaign has not been published yet, the integration shows a Draft pill and the note Saved as draft — it goes live when you publish the campaign. On a published campaign it is applied right away and shows as Active.
Change or remove the integration
The Integrations tab lists every integration on the campaign with its list name (List: {your list}).
Change list / Edit mapping reopens the wizard at that step.
Remove takes it off this campaign: Remove from this campaign? The account connection stays and can be added again. Your API key is not deleted, so you can reuse it on another campaign.
Welcome emails
Sending a welcome email to a new subscriber is set up on the Omnisend side, in their automation tools — an Omnisend Premium package is needed for it. There is no welcome-email switch in the OptiMonk integration wizard.