Completes the ACH authorization process using Plaid Link integration.

Business Context:
This endpoint processes the Plaid Link results after the customer has successfully
connected their bank account through the Plaid interface.

Prerequisites:

• Application must be in approved status
• Customer must have completed Plaid Link flow with valid public token
• Required customer information must be provided

Integration Flow:

1. Get ACH authorization details from GET endpoint
2. Initialize Plaid Link with the provided token
3. Customer completes bank account selection in Plaid interface
4. Plaid returns a public token
5. Submit the public token and customer details to this endpoint

Required Information:

• Customer's full legal name (must match bank account)
• Contact email and phone number
• Plaid public token from successful Link session

Security Notes:

• Plaid tokens expire after 30 minutes
• Customer information is validated against application data
• Bank account information is securely stored and encrypted