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