`Unified Click to Pay` {#boarding-click-to-pay}
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`Unified Click to Pay`, powered by `Unified Checkout`, provides a flexible integration that enables merchants to customize their checkout experience for accepting `Click to Pay` payments from Visa, Mastercard, and American Express. The `Unified Click to Pay` SDK has no UI and the UI must be configured by the integrator. This enables merchants and partners to fully control the UI and branding. `Unified Click to Pay` offers advanced security and compliance and is PCI 4.0 compliant.

Prerequisites {#boarding-click-to-pay_section_pdz_lgp_2jc}
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You must meet these requirements to enable and configure `Unified Click to Pay` for your merchants:

* `Unified Checkout` must be enabled at the portfolio level before it can be added to merchant accounts. To enable at the `Unified Checkout` at the portfolio level, contact your sales representative.
* Create a REST API Shared Secret Key.
* Enable message-level encryption.
  {#boarding-click-to-pay_ul_wfg_hbt_fjc}