Client sales / onboarding portal

We are seeking a client an experienced developer(s) to build a client onboarding portal, which will accept input from the client in a responsive form, and depending on the input will generate a quote. The portal will need to support a flexible workflow, and be able to make API calls to 3rd party platforms (such as SMS gateways).

The poral will need to allow the client to make payment via industry recognised payment gateways (Paypal, Commbank)

The site will need to be styled to integrate into the existing website (WordPress).