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Edit File: ActionCollectPaymentSettings.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

return apply_filters( 'ninja_forms_action_collect_payment_settings', array(

/*
    |--------------------------------------------------------------------------
    | Payment Gateways
    |--------------------------------------------------------------------------
    */

'payment_gateways' => array(
        'name' => 'payment_gateways',
        'type' => 'select',
        'label' => esc_html__( 'Payment Gateways', 'ninja-forms' ),
        'options' => array(
            array(
                'label' => '--',
                'value' => ''
            ),
        ),
        'value' => '',
        'width' => 'full',
        'group' => 'primary',
    ),

/*
    |--------------------------------------------------------------------------
    | Payment Type
    |--------------------------------------------------------------------------
    */

//building the payment type selector box
    'payment_total_type' =>  array(
        'name' => 'payment_total_type',
        'type' => 'select',
        'label' => esc_html__( 'Get Total From', 'ninja-forms' ),
        'width' => 'one-half',
        'group' => 'primary',
        'options' => array(
            array( 'label' => esc_html__( '- Select One', 'ninja-forms' ), 'value' => '' ),
            array( 'label' => esc_html__( 'Calculation', 'ninja-forms' ), 'value' => 'calc' ),
            array( 'label' => esc_html__( 'Field', 'ninja-forms' ), 'value' => 'field' ),
            array( 'label' => esc_html__( 'Fixed Amount', 'ninja-forms' ), 'value' => 'fixed' ),
        ),
    ),

//building the calc selector.
    'payment_total_calc' => array(
        'name' => 'payment_total',
        'total_type'  => 'calc',
        'type' => 'select',
        'label' => esc_html__( 'Select Calculation', 'ninja-forms' ),
        'width' => 'one-half',
        'group' => 'primary',
        'deps' => array(
            'payment_total_type' => 'calc',
        ),
        'default_options' => array(
            'label' => esc_html__( '- Select One', 'ninja-forms' ),
            'value' => '0',
        ),
        'use_merge_tags' => TRUE,
    ),

//building the field selector.
    'payment_total_field' => array(
        'name' => 'payment_total',
        'total_type' => 'field',
        'type' => 'select',
        'help' => sprintf( '%s:<br />%s', esc_html__( 'Allowed Field Types', 'ninja-forms' ), esc_html__( 'Number, Single Checkbox, Select, Multi-Select, Radio List, Checkbox List, Select Image', 'ninja-forms' ) ),
        'label' => esc_html__( 'Select Field', 'ninja-forms' ),
        'width' => 'one-half',
        'group' => 'primary',
        'deps' => array(
            'payment_total_type' => 'field',
        ),
        'default_options' => array(
            'label' => esc_html__( '- Select One', 'ninja-forms' ),
            'value' => '0',
        ),
    ),

//building the field selector.
    'payment_total_fixed' => array(
        'name' => 'payment_total',
        'total_type' => 'fixed',
        'type' => 'textbox',
        'label' => esc_html__( 'Enter Amount', 'ninja-forms' ),
        'width' => 'one-half',
        'group' => 'primary',
        'value' => '0',
        'deps' => array(
            'payment_total_type' => 'fixed',
        ),
    ),
));

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