You can follow the steps in this Guide from Paylocity on how to navigate to the Integrations Marketplace, enable API Access, and eventually link your account in Merge.
Note: There may be a cost associated with the API setup + gathering of credentials from Paylocity.
If these steps do not apply to you, and you are connecting to a non-Paylocity Partner, please follow this guide instead!
Step 1: Sign into Paylocity
Step 2: Navigate to the Integrations Marketplace
You should navigate to HR & Payroll > Web App > Web Services > Integrations > "Browse Marketplace"
Step 3: Browse to find the specific Organization you are trying to connect to
Step 4: Click "Begin Integration" and sign the PADE (“Paylocity Automated Data Exchange”) form
Step 5: Submit the form and wait for Paylocity to confirm.
It can take a few days for Paylocity to confirm the PADE request. It is not an instant approval.
Step 6: Once Paylocity confirms your request, input your Company ID into Link