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「core/models.py」ファイルを編集します。

記述編集　【Desktop/crowdsource/core/models.py】

import uuid
from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone

# Create your models here.
class Customer(models.Model):
  user = models.OneToOneField(User, on_delete=models.CASCADE)
  avatar = models.ImageField(upload_to='customer/avatars/', blank=True, null=True)
  phone_number = models.CharField(max_length=50, blank=True)
  stripe_customer_id = models.CharField(max_length=255, blank=True)
  stripe_payment_method_id = models.CharField(max_length=255, blank=True)
  stripe_card_last4 = models.CharField(max_length=255, blank=True)

  def __str__(self):
    return self.user.get_full_name()

class Courier(models.Model):
  user = models.OneToOneField(User, on_delete=models.CASCADE)
  lat = models.FloatField(default=0)
  lng = models.FloatField(default=0)
  paypal_email = models.EmailField('PayPalメールアドレス', max_length=255, blank=True)

  def __str__(self):
    return self.user.get_full_name()


class Category(models.Model):
  slug = models.CharField(max_length=255, unique=True)
  name = models.CharField(max_length=255)

  def __str__(self):
    return self.name

class Job(models.Model):
  SMALL_SIZE = "small"
  MEDIUM_SIZE = "medium"
  LARGE_SIZE = "large"
  SIZES = (
    (SMALL_SIZE, '小'),
    (MEDIUM_SIZE, '中'),
    (LARGE_SIZE, '大'),
  )

  CREATING_STATUS = 'creating'
  PROCESSING_STATUS = 'processing'
  PICKING_STATUS = 'picking'
  DELIVERING_STATUS = 'delivering'
  COMPLETED_STATUS = 'completed'
  CANCELED_STATUS = 'canceled'
  STATUSES = (
    (CREATING_STATUS, 'Creating'),
    (PROCESSING_STATUS, 'Processing'),
    (PICKING_STATUS, 'Picking'),
    (DELIVERING_STATUS, 'Delivering'),
    (COMPLETED_STATUS, 'Completed'),
    (CANCELED_STATUS, 'Canceled'),
  )

  # Step 1
  id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
  customer = models.ForeignKey(Customer, on_delete=models.CASCADE, verbose_name='配達依頼人')
  courier = models.ForeignKey(Courier, on_delete=models.CASCADE, null=True, blank=True)
  name = models.CharField('配達依頼名', max_length=255)
  description = models.CharField('備考', max_length=255)
  category = models.ForeignKey(Category, on_delete=models.SET_NULL, null=True, blank=True, verbose_name='カテゴリー')
  size = models.CharField('サイズ', max_length=20, choices=SIZES, default=MEDIUM_SIZE)
  quantity = models.IntegerField('数量', default=1)
  photo = models.ImageField('写真', upload_to='job/photos/')
  status = models.CharField('状態', max_length=20, choices=STATUSES, default=CREATING_STATUS)
  created_at = models.DateTimeField(default=timezone.now, verbose_name='登録日')

  # Step 2
  pickup_address = models.CharField('荷物受取先住所', max_length=255, blank=True)
  pickup_lat = models.FloatField('依頼人緯度', default=0)
  pickup_lng = models.FloatField('依頼人経度', default=0)
  pickup_name = models.CharField('依頼人氏名', max_length=255, blank=True)
  pickup_phone = models.CharField('依頼人電話番号', max_length=50, blank=True)

  # Step 3
  delivery_address = models.CharField('配達先住所', max_length=255, blank=True)
  delivery_lat = models.FloatField('配達先緯度', default=0)
  delivery_lng = models.FloatField('配達先経度',default=0)
  delivery_name = models.CharField('配達先氏名',max_length=255, blank=True)
  delivery_phone = models.CharField('配達先電話番号',max_length=50, blank=True)

  # Step 4
  duration = models.IntegerField('移動時間' ,default=0)
  distance = models.FloatField('距離' ,default=0)
  price = models.IntegerField('料金', default=0)

  # その他
  pickup_photo = models.ImageField(upload_to='job/pickup_photos/', null=True, blank=True)
  pickedup_at = models.DateTimeField(null=True, blank=True)

  delivery_photo = models.ImageField(upload_to='job/delivery_photos/', null=True, blank=True)
  delivered_at = models.DateTimeField(null=True, blank=True)  

  def __str__(self):
    return self.description

class Transaction(models.Model):

  IN_STATUS = "in"
  OUT_STATUS = "out"
  STATUSES = (
    (IN_STATUS, 'In'),
    (OUT_STATUS, 'Out'),
  )

  stripe_payment_intent_id = models.CharField(max_length=255, unique=True)
  job = models.ForeignKey(Job, on_delete=models.CASCADE)
  amount = models.FloatField(default=0)
  status = models.CharField(max_length=20, choices=STATUSES, default=IN_STATUS)
  created_at = models.DateTimeField(default=timezone.now)

  def __str__(self):
    return self.stripe_payment_intent_id

マイグレーションファイルを作成します。
コマンド
python manage.py makemigrations

マイグレーションを適用します。
コマンド
python manage.py migrate

「core/admin.py」ファイルを編集します。

記述編集　【Desktop/crowdsource/core/admin.py】

from django.contrib import admin
from . import models

class TransactionAdmin(admin.ModelAdmin):
  list_display = ['stripe_payment_intent_id', 'courier_paypal_email', 'customer', 'courier', 'job', 'amount', 'status', 'created_at']
  list_filter = ['status',]

  def customer(self, obj):
    return obj.job.customer

  def courier(self, obj):
    return obj.job.courier

  def courier_paypal_email(sefl, obj):
    return obj.job.courier.paypal_email if obj.job.courier else None

# Register your models here.
admin.site.register(models.Customer)
admin.site.register(models.Courier)
admin.site.register(models.Category)
admin.site.register(models.Job)
admin.site.register(models.Transaction, TransactionAdmin)