Get P45 form for an employee

curl --request GET \
  --url https://api.sandbox.flowpayroll.ai/v1/p45/{employeeId} \
  --header 'X-Auth-Token: <api-key>'

{
  "message": {
    "text": "P45 Form Retrieved",
    "token": "p45FormRetrieved"
  },
  "content": {
    "data": {
      "employeeDetails": {
        "id": "EMP01JPW80Q2B7Q9RGGRY29VGC8WM",
        "payrollId": "PAY001",
        "nationalInsuranceNumber": "AB123456C",
        "department": "Engineering",
        "jobTitle": "Software Engineer",
        "email": "john.doe@example.com",
        "name": {
          "title": "Mr",
          "firstName": "John",
          "lastName": "Doe",
          "initials": "JD"
        },
        "hasStudentLoanDeductions": false,
        "hasPostGraduateLoanDeductions": false,
        "address": {
          "line1": "123 Main Street",
          "line2": "Apartment 4B",
          "city": "London",
          "county": "Greater London",
          "postcode": "SW1A 1AA",
          "countryCode": "GB"
        },
        "birthGender": "Male",
        "birthDate": "1980-01-12",
        "employeeLeaverDetails": {
          "leavingDate": "2024-06-15",
          "reason": "Resignation",
          "issuedBy": "HR Department"
        }
      },
      "employerDetails": {
        "id": "ORG001",
        "name": {
          "legalName": "Acme Corporation Ltd",
          "tradingName": "Acme Corp"
        },
        "taxReferenceNumbers": {
          "employerPayeReference": {
            "officeNumber": "123",
            "referenceNumber": "AB12345"
          },
          "accountsOfficeReference": "123PX00123456",
          "selfAssessmentUniqueTaxpayerReference": "1234567890",
          "corporationTaxReferenceUniqueTaxpayerReference": "1234567890"
        },
        "address": {
          "line1": "456 Business Park",
          "line2": "Suite 100",
          "city": "Manchester",
          "county": "Greater Manchester",
          "postcode": "M1 1AA",
          "countryCode": "GB"
        }
      },
      "taxDetails": {
        "taxCodeAtLeavingDate": "1257L",
        "taxCodeWeek1Month1": false,
        "totalPayToDate": 25000,
        "totalTaxToDate": 3750,
        "totalPayInThisEmployment": 25000,
        "totalTaxInThisEmployment": 3750,
        "weekNumber": 1
      },
      "createdBy": "system",
      "createdDate": "2024-06-15T10:00:00Z",
      "updatedBy": "system",
      "updatedDate": "2024-06-15T10:00:00Z"
    }
  }
}