feat(payment): add complete payment system with multi-provider support

Add a full payment and subscription system supporting EasyPay (Alipay/WeChat),
Stripe, and direct Alipay/WeChat Pay providers with multi-instance load balancing.

backend/ent/paymentorder_delete.go

+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"context"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+	"entgo.io/ent/schema/field"
+	"github.com/Wei-Shaw/sub2api/ent/paymentorder"
+	"github.com/Wei-Shaw/sub2api/ent/predicate"
+)
+
+// PaymentOrderDelete is the builder for deleting a PaymentOrder entity.
+type PaymentOrderDelete struct {
+	config
+	hooks    []Hook
+	mutation *PaymentOrderMutation
+}
+
+// Where appends a list predicates to the PaymentOrderDelete builder.
+func (_d *PaymentOrderDelete) Where(ps ...predicate.PaymentOrder) *PaymentOrderDelete {
+	_d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query and returns how many vertices were deleted.
+func (_d *PaymentOrderDelete) Exec(ctx context.Context) (int, error) {
+	return withHooks(ctx, _d.sqlExec, _d.mutation, _d.hooks)
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *PaymentOrderDelete) ExecX(ctx context.Context) int {
+	n, err := _d.Exec(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func (_d *PaymentOrderDelete) sqlExec(ctx context.Context) (int, error) {
+	_spec := sqlgraph.NewDeleteSpec(paymentorder.Table, sqlgraph.NewFieldSpec(paymentorder.FieldID, field.TypeInt64))
+	if ps := _d.mutation.predicates; len(ps) > 0 {
+		_spec.Predicate = func(selector *sql.Selector) {
+			for i := range ps {
+				ps[i](selector)
+			}
+		}
+	}
+	affected, err := sqlgraph.DeleteNodes(ctx, _d.driver, _spec)
+	if err != nil && sqlgraph.IsConstraintError(err) {
+		err = &ConstraintError{msg: err.Error(), wrap: err}
+	}
+	_d.mutation.done = true
+	return affected, err
+}
+
+// PaymentOrderDeleteOne is the builder for deleting a single PaymentOrder entity.
+type PaymentOrderDeleteOne struct {
+	_d *PaymentOrderDelete
+}
+
+// Where appends a list predicates to the PaymentOrderDelete builder.
+func (_d *PaymentOrderDeleteOne) Where(ps ...predicate.PaymentOrder) *PaymentOrderDeleteOne {
+	_d._d.mutation.Where(ps...)
+	return _d
+}
+
+// Exec executes the deletion query.
+func (_d *PaymentOrderDeleteOne) Exec(ctx context.Context) error {
+	n, err := _d._d.Exec(ctx)
+	switch {
+	case err != nil:
+		return err
+	case n == 0:
+		return &NotFoundError{paymentorder.Label}
+	default:
+		return nil
+	}
+}
+
+// ExecX is like Exec, but panics if an error occurs.
+func (_d *PaymentOrderDeleteOne) ExecX(ctx context.Context) {
+	if err := _d.Exec(ctx); err != nil {
+		panic(err)
+	}
+}

backend/ent/paymentproviderinstance.go

+// Code generated by ent, DO NOT EDIT.
+
+package ent
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect/sql"
+	"github.com/Wei-Shaw/sub2api/ent/paymentproviderinstance"
+)
+
+// PaymentProviderInstance is the model entity for the PaymentProviderInstance schema.
+type PaymentProviderInstance struct {
+	config `json:"-"`
+	// ID of the ent.
+	ID int64 `json:"id,omitempty"`
+	// ProviderKey holds the value of the "provider_key" field.
+	ProviderKey string `json:"provider_key,omitempty"`
+	// Name holds the value of the "name" field.
+	Name string `json:"name,omitempty"`
+	// Config holds the value of the "config" field.
+	Config string `json:"config,omitempty"`
+	// SupportedTypes holds the value of the "supported_types" field.
+	SupportedTypes string `json:"supported_types,omitempty"`
+	// Enabled holds the value of the "enabled" field.
+	Enabled bool `json:"enabled,omitempty"`
+	// PaymentMode holds the value of the "payment_mode" field.
+	PaymentMode string `json:"payment_mode,omitempty"`
+	// SortOrder holds the value of the "sort_order" field.
+	SortOrder int `json:"sort_order,omitempty"`
+	// Limits holds the value of the "limits" field.
+	Limits string `json:"limits,omitempty"`
+	// RefundEnabled holds the value of the "refund_enabled" field.
+	RefundEnabled bool `json:"refund_enabled,omitempty"`
+	// CreatedAt holds the value of the "created_at" field.
+	CreatedAt time.Time `json:"created_at,omitempty"`
+	// UpdatedAt holds the value of the "updated_at" field.
+	UpdatedAt    time.Time `json:"updated_at,omitempty"`
+	selectValues sql.SelectValues
+}
+
+// scanValues returns the types for scanning values from sql.Rows.
+func (*PaymentProviderInstance) scanValues(columns []string) ([]any, error) {
+	values := make([]any, len(columns))
+	for i := range columns {
+		switch columns[i] {
+		case paymentproviderinstance.FieldEnabled, paymentproviderinstance.FieldRefundEnabled:
+			values[i] = new(sql.NullBool)
+		case paymentproviderinstance.FieldID, paymentproviderinstance.FieldSortOrder:
+			values[i] = new(sql.NullInt64)
+		case paymentproviderinstance.FieldProviderKey, paymentproviderinstance.FieldName, paymentproviderinstance.FieldConfig, paymentproviderinstance.FieldSupportedTypes, paymentproviderinstance.FieldPaymentMode, paymentproviderinstance.FieldLimits:
+			values[i] = new(sql.NullString)
+		case paymentproviderinstance.FieldCreatedAt, paymentproviderinstance.FieldUpdatedAt:
+			values[i] = new(sql.NullTime)
+		default:
+			values[i] = new(sql.UnknownType)
+		}
+	}
+	return values, nil
+}
+
+// assignValues assigns the values that were returned from sql.Rows (after scanning)
+// to the PaymentProviderInstance fields.
+func (_m *PaymentProviderInstance) assignValues(columns []string, values []any) error {
+	if m, n := len(values), len(columns); m < n {
+		return fmt.Errorf("mismatch number of scan values: %d != %d", m, n)
+	}
+	for i := range columns {
+		switch columns[i] {
+		case paymentproviderinstance.FieldID:
+			value, ok := values[i].(*sql.NullInt64)
+			if !ok {
+				return fmt.Errorf("unexpected type %T for field id", value)
+			}
+			_m.ID = int64(value.Int64)
+		case paymentproviderinstance.FieldProviderKey:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field provider_key", values[i])
+			} else if value.Valid {
+				_m.ProviderKey = value.String
+			}
+		case paymentproviderinstance.FieldName:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field name", values[i])
+			} else if value.Valid {
+				_m.Name = value.String
+			}
+		case paymentproviderinstance.FieldConfig:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field config", values[i])
+			} else if value.Valid {
+				_m.Config = value.String
+			}
+		case paymentproviderinstance.FieldSupportedTypes:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field supported_types", values[i])
+			} else if value.Valid {
+				_m.SupportedTypes = value.String
+			}
+		case paymentproviderinstance.FieldEnabled:
+			if value, ok := values[i].(*sql.NullBool); !ok {
+				return fmt.Errorf("unexpected type %T for field enabled", values[i])
+			} else if value.Valid {
+				_m.Enabled = value.Bool
+			}
+		case paymentproviderinstance.FieldPaymentMode:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field payment_mode", values[i])
+			} else if value.Valid {
+				_m.PaymentMode = value.String
+			}
+		case paymentproviderinstance.FieldSortOrder:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for field sort_order", values[i])
+			} else if value.Valid {
+				_m.SortOrder = int(value.Int64)
+			}
+		case paymentproviderinstance.FieldLimits:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field limits", values[i])
+			} else if value.Valid {
+				_m.Limits = value.String
+			}
+		case paymentproviderinstance.FieldRefundEnabled:
+			if value, ok := values[i].(*sql.NullBool); !ok {
+				return fmt.Errorf("unexpected type %T for field refund_enabled", values[i])
+			} else if value.Valid {
+				_m.RefundEnabled = value.Bool
+			}
+		case paymentproviderinstance.FieldCreatedAt:
+			if value, ok := values[i].(*sql.NullTime); !ok {
+				return fmt.Errorf("unexpected type %T for field created_at", values[i])
+			} else if value.Valid {
+				_m.CreatedAt = value.Time
+			}
+		case paymentproviderinstance.FieldUpdatedAt:
+			if value, ok := values[i].(*sql.NullTime); !ok {
+				return fmt.Errorf("unexpected type %T for field updated_at", values[i])
+			} else if value.Valid {
+				_m.UpdatedAt = value.Time
+			}
+		default:
+			_m.selectValues.Set(columns[i], values[i])
+		}
+	}
+	return nil
+}
+
+// Value returns the ent.Value that was dynamically selected and assigned to the PaymentProviderInstance.
+// This includes values selected through modifiers, order, etc.
+func (_m *PaymentProviderInstance) Value(name string) (ent.Value, error) {
+	return _m.selectValues.Get(name)
+}
+
+// Update returns a builder for updating this PaymentProviderInstance.
+// Note that you need to call PaymentProviderInstance.Unwrap() before calling this method if this PaymentProviderInstance
+// was returned from a transaction, and the transaction was committed or rolled back.
+func (_m *PaymentProviderInstance) Update() *PaymentProviderInstanceUpdateOne {
+	return NewPaymentProviderInstanceClient(_m.config).UpdateOne(_m)
+}
+
+// Unwrap unwraps the PaymentProviderInstance entity that was returned from a transaction after it was closed,
+// so that all future queries will be executed through the driver which created the transaction.
+func (_m *PaymentProviderInstance) Unwrap() *PaymentProviderInstance {
+	_tx, ok := _m.config.driver.(*txDriver)
+	if !ok {
+		panic("ent: PaymentProviderInstance is not a transactional entity")
+	}
+	_m.config.driver = _tx.drv
+	return _m
+}
+
+// String implements the fmt.Stringer.
+func (_m *PaymentProviderInstance) String() string {
+	var builder strings.Builder
+	builder.WriteString("PaymentProviderInstance(")
+	builder.WriteString(fmt.Sprintf("id=%v, ", _m.ID))
+	builder.WriteString("provider_key=")
+	builder.WriteString(_m.ProviderKey)
+	builder.WriteString(", ")
+	builder.WriteString("name=")
+	builder.WriteString(_m.Name)
+	builder.WriteString(", ")
+	builder.WriteString("config=")
+	builder.WriteString(_m.Config)
+	builder.WriteString(", ")
+	builder.WriteString("supported_types=")
+	builder.WriteString(_m.SupportedTypes)
+	builder.WriteString(", ")
+	builder.WriteString("enabled=")
+	builder.WriteString(fmt.Sprintf("%v", _m.Enabled))
+	builder.WriteString(", ")
+	builder.WriteString("payment_mode=")
+	builder.WriteString(_m.PaymentMode)
+	builder.WriteString(", ")
+	builder.WriteString("sort_order=")
+	builder.WriteString(fmt.Sprintf("%v", _m.SortOrder))
+	builder.WriteString(", ")
+	builder.WriteString("limits=")
+	builder.WriteString(_m.Limits)
+	builder.WriteString(", ")
+	builder.WriteString("refund_enabled=")
+	builder.WriteString(fmt.Sprintf("%v", _m.RefundEnabled))
+	builder.WriteString(", ")
+	builder.WriteString("created_at=")
+	builder.WriteString(_m.CreatedAt.Format(time.ANSIC))
+	builder.WriteString(", ")
+	builder.WriteString("updated_at=")
+	builder.WriteString(_m.UpdatedAt.Format(time.ANSIC))
+	builder.WriteByte(')')
+	return builder.String()
+}
+
+// PaymentProviderInstances is a parsable slice of PaymentProviderInstance.
+type PaymentProviderInstances []*PaymentProviderInstance