add createDepositOrder mutation

app/graphql/inputs/create_deposit_order_attributes_input.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+module Inputs
+  class CreateDepositOrderAttributesInput < Types::BaseInputObject
+    argument :amount_cents, Integer, "Amount to be paid", required: true
+  end
+end

app/graphql/mutations/create_deposit_order.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+module Mutations
+  class CreateDepositOrder < BaseMutation
+    field :order, Types::DepositOrderType, null: true
+
+    argument :order, Inputs::CreateStakeOrderAttributesInput, required: true
+
+    def resolve(order:)
+      ActiveRecord::Base.transaction do
+        record = BuildDepositOrder.new(paid_amount_cents: order[:amount_cents], user: current_user.id)
+        record.save!
+
+        { order: record }
+      rescue ActiveRecord::RecordInvalid => e
+        { errors: Resolvers::ModelErrors.from_active_record_model(e.record) }
+      end
+    end
+  end
+end

app/graphql/types/mutation_type.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 module Types
   class MutationType < Types::BaseObject
+    field :create_deposit_order, mutation: Mutations::CreateDepositOrder
     field :create_stake_remove_order, mutation: Mutations::CreateStakeRemoveOrder
     field :create_stake_order, mutation: Mutations::CreateStakeOrder
     field :create_sell_crypto_order, mutation: Mutations::CreateSellCryptoOrder

app/javascript/__generated__/schema.graphql

@@ -76,6 +76,33 @@ type CreateBuyCryptoOrderPayload {
   order: BuyCryptoOrder
 }
 
+"""
+Autogenerated input type of CreateDepositOrder
+"""
+input CreateDepositOrderInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+  order: CreateStakeOrderAttributesInput!
+}
+
+"""
+Autogenerated return type of CreateDepositOrder
+"""
+type CreateDepositOrderPayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  Errors encountered during execution of the mutation.
+  """
+  errors: [RecordInvalid!]
+  order: DepositOrder
+}
+
 input CreateSellCryptoOrderAttributesInput {
   """
   Amount to be paid
@@ -233,6 +260,12 @@ type Mutation {
     """
     input: CreateBuyCryptoOrderInput!
   ): CreateBuyCryptoOrderPayload
+  createDepositOrder(
+    """
+    Parameters for CreateDepositOrder
+    """
+    input: CreateDepositOrderInput!
+  ): CreateDepositOrderPayload
   createSellCryptoOrder(
     """
     Parameters for CreateSellCryptoOrder

app/services/build_deposit_order.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+class BuildDepositOrder
+  DEPOSIT_FEE = 0.05
+
+  attr_reader :paid_amount_cents, :user_id
+
+  def initilize(paid_amount_cents:, user_id:)
+    @paid_amount_cents = paid_amount_cents
+    @user_id = user_id
+  end
+
+  def build
+    DepositOrder.new(
+      user_id: user_id,
+      paid_amount_cents: paid_amount_cents,
+      received_amount_cents: paid_amount_cents + (paid_amount_cents * DEPOSIT_FEE)
+    )
+  end
+end